Deleting last rule in Security Group does not update firewall

Scenario:
     VM port with 1 Security Group with 1 egress icmp rule
(example rule:
{u'ethertype': u'IPv4', u'direction': u'egress', u'protocol': u'icmp', u'dest_ip_prefix': u'0.0.0.0/0'}
)

Steps:
     Delete the (last) rule from the above Security Group via Horizon

Result:
    Find that iptables shows the egress icmp rule even after its deletion

Root Cause:
    In this scenario, security_group_info_for_devices() returns the following to the agent: Note that the
 'security_groups ' field is an empty dictionary {} !! this causes _update_security_groups_info in the agent to NOT update firewall.

The security_groups field must contain the security_group_id as key with an empty list for the rules.

{u'sg_member_ips': {}, u'devices': {u'ea19fb55-39bb-4e59-9d10-26c74eb3ff95': {u'status': u'ACTIVE', u'security_group_source_groups': [], u'binding:host_id': u'vRHEL29-1', u'name': u'', u'allowed_address_pairs': [{u'ip_address': u'10.0.0.201', u'mac_address': u'fa:16:3e:02:4b:b3'}, {u'ip_address': u'10.0.10.202', u'mac_address': u'fa:16:3e:02:4b:b3'}, {u'ip_address': u'10.0.20.203', u'mac_address': u'fa:16:3e:02:4b:b3'}], u'admin_state_up': True, u'network_id': u'f665dc8c-76da-4fde-8d26-535871487e4c', u'tenant_id': u'f5019aeae9e64443970bb0842e22e2b3', u'extra_dhcp_opts': [], u'security_group_rules': [{u'source_port_range_min': 67, u'direction': u'ingress', u'protocol': u'udp', u'ethertype': u'IPv4', u'port_range_max': 68, u'source_port_range_max': 67, u'source_ip_prefix': u'10.0.2.3', u'port_range_min': 68}], u'binding:vif_details': {u'port_filter': False}, u'binding:vif_type': u'bridge', u'device_owner': u'compute:nova', u'mac_address': u'fa:16:3e:02:4b:b3', u'device': u'tapea19fb55-39', u'binding:profile': {}, u'binding:vnic_type': u'normal', u'fixed_ips': [u'10.0.2.6'], u'id': u'ea19fb55-39bb-4e59-9d10-26c74eb3ff95', u'security_groups': [u'849ee59c-d100-4940-930b-44e358775ed3'], u'device_id': u'2b330c29-c16f-4bbf-b80a-bd5bae41b514'}}, u'security_groups': {}} security_group_info_for_devices /usr/lib/python2.6/site-packages/neutron/agent/securitygroups_rpc.py:104