UnhashableKeyWarning in openstack_dashboard.api.nova extension_supported

When horizon runs with tox -e runserver with python3, the following message is output as an error message. This potentially pollutes the error log file with unnecessary messages.

UnhashableKeyWarning: The key of openstack_dashboard.api.nova extension_supported is not hashable and cannot be memoized: (('Aggregates', (<ListExtResource alias=NMN, description=Multiple network support., links=[], name=Multinic, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-DCF, description=Disk Management Extension., links=[], name=DiskConfig, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-EXT-AZ, description=Extended Availability Zone support., links=[], name=ExtendedAvailabilityZone, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-EXT-IMG-SIZE, description=Adds image size to image listings., links=[], name=ImageSize, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-EXT-IPS, description=Adds type parameter to the ip list., links=[], name=ExtendedIps, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-EXT-IPS-MAC, description=Adds mac address parameter to the ip list., links=[], name=ExtendedIpsMac, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-EXT-SRV-ATTR, description=Extended Server Attributes support., links=[], name=ExtendedServerAttributes, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-EXT-STS, description=Extended Status support., links=[], name=ExtendedStatus, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-FLV-DISABLED, description=Support to show the disabled status of a flavor., links=[], name=FlavorDisabled, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-FLV-EXT-DATA, description=Provide additional data for flavors., links=[], name=FlavorExtraData, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-SCH-HNT, description=Pass arbitrary key/value pairs to the scheduler., links=[], name=SchedulerHints, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=OS-SRV-USG, description=Adds launched_at and terminated_at on Servers., links=[], name=ServerUsage, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-access-ips, description=Access IPs support., links=[], name=AccessIPs, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-admin-actions, description=Enable admin-only server actions

    Actions include: resetNetwork, injectNetworkInfo, os-resetState
    , links=[], name=AdminActions, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-admin-password, description=Admin password management support., links=[], name=AdminPassword, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-agents, description=Agents support., links=[], name=Agents, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-aggregates, description=Admin-only aggregate administration., links=[], name=Aggregates, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-assisted-volume-snapshots, description=Assisted volume snapshots., links=[], name=AssistedVolumeSnapshots, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-attach-interfaces, description=Attach interface support., links=[], name=AttachInterfaces, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-availability-zone, description=1. Add availability_zone to the Create Server API.
       2. Add availability zones describing.
    , links=[], name=AvailabilityZone, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-baremetal-ext-status, description=Add extended status in Baremetal Nodes v2 API., links=[], name=BareMetalExtStatus, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-baremetal-nodes, description=Admin-only bare-metal node administration., links=[], name=BareMetalNodes, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-block-device-mapping, description=Block device mapping boot support., links=[], name=BlockDeviceMapping, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-block-device-mapping-v2-boot, description=Allow boot with the new BDM data format., links=[], name=BlockDeviceMappingV2Boot, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-cell-capacities, description=Adding functionality to get cell capacities., links=[], name=CellCapacities, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-cells, description=Enables cells-related functionality such as adding neighbor cells,

.....

iption=Provide data on migrations., links=[], name=Migrations, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-multiple-create, description=Allow multiple create in the Create Server v2.1 API., links=[], name=MultipleCreate, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-networks, description=Admin-only Network Management Extension., links=[], name=Networks, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-networks-associate, description=Network association support., links=[], name=NetworkAssociationSupport, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-pause-server, description=Enable pause/unpause server actions., links=[], name=PauseServer, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-personality, description=Personality support., links=[], name=Personality, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-preserve-ephemeral-rebuild, description=Allow preservation of the ephemeral partition on rebuild., links=[], name=PreserveEphemeralOnRebuild, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-quota-class-sets, description=Quota classes management support., links=[], name=QuotaClasses, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-quota-sets, description=Quotas management support., links=[], name=Quotas, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-rescue, description=Instance rescue mode., links=[], name=Rescue, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-security-group-default-rules, description=Default rules for security group support., links=[], name=SecurityGroupDefaultRules, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-security-groups, description=Security group support., links=[], name=SecurityGroups, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-diagnostics, description=Allow Admins to view server diagnostics through server action., links=[], name=ServerDiagnostics, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-external-events, description=Server External Event Triggers., links=[], name=ServerExternalEvents, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-group-quotas, description=Adds quota support to server groups., links=[], name=ServerGroupQuotas, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-groups, description=Server group support., links=[], name=ServerGroups, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-list-multi-status, description=Allow to filter the servers by a set of status values., links=[], name=ServerListMultiStatus, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-password, description=Server password support., links=[], name=ServerPassword, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-sort-keys, description=Add sorting support in get Server v2 API., links=[], name=ServerSortKeys, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-server-start-stop, description=Start/Stop instance compute API support., links=[], name=ServerStartStop, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-services, description=Services support., links=[], name=Services, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-shelve, description=Instance shelve mode., links=[], name=Shelve, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-simple-tenant-usage, description=Simple tenant usage extension., links=[], name=SimpleTenantUsage, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-suspend-server, description=Enable suspend/resume server actions., links=[], name=SuspendServer, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-tenant-networks, description=Tenant-based Network Management Extension., links=[], name=OSTenantNetworks, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-used-limits, description=Provide data on limited resources that are being used., links=[], name=UsedLimits, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-used-limits-for-admin, description=Provide data to admin on limited resources used by other tenants., links=[], name=UsedLimitsForAdmin, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-user-data, description=Add user_data to the Create Server API., links=[], name=UserData, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-user-quotas, description=Project user quota support., links=[], name=UserQuotas, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-virtual-interfaces, description=Virtual interface support., links=[], name=VirtualInterfaces, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-volume-attachment-update, description=Support for updating a volume attachment., links=[], name=VolumeAttachmentUpdate, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>, <ListExtResource alias=os-volumes, description=Volumes support., links=[], name=Volumes, namespace=http://docs.openstack.org/compute/ext/fake_xml, updated=2014-12-03T00:00:00Z>)), ())