oslo.messaging.rpc.dispatcher AttributeError: 'Connection' object has no attribute 'connection_errors'

Starting with nova-cloud-controller/next rev179 and nova-compute/next rev149 (which were c-h syncs), functional tests for > Trusty-Juno began to fail. New instances are in an ERROR state. Messages are timing out.

# amulet test - new instances are in ERROR status:
01:09:19.296 2015-08-01 03:19:59,429 create_instance DEBUG: instance status: ERROR
01:09:19.296 2015-08-01 03:19:59,429 create_instance ERROR: instance creation timed out
01:09:19.296 Instance create failed
01:09:19.297
01:09:19.297 juju-test.conductor.016-basic-trusty-juno DEBUG : Got exit code: 1
01:09:19.297 juju-test.conductor.016-basic-trusty-juno RESULT : FAIL

# n-c-c's nova-conductor log:
2015-08-01 03:15:46.121 23994 TRACE oslo.messaging.rpc.dispatcher AttributeError: 'Connection' object has no attribute 'connection_errors'

# nova-compute's nova-compute.log:
2015-08-01 03:16:46.052 24453 TRACE nova.openstack.common.threadgroup MessagingTimeout: Timed out waiting for a reply to message ID 06f90e0970814f29a1db29b2a7555e67

For full traces & other info:
http://paste.ubuntu.com/11987079/

# FYI, last known good @ n-c-c/next r178:
http://paste.ubuntu.com/11987089/

# FYI, last known good @ nova-compute/next r149:
http://paste.ubuntu.com/11990321/