Issue

• VIP network interface in the qlbaas namespaces are not recreated when the OpenStack cluster is standby/unstandby

(1) Standby OpenStack cluster
[root@os3ctrl03 ~]# pcs cluster standby --all

(2) Note HAProxy loadbalancer process is still running:
[root@os3ctrl03 ~]# ps -ef | grep lbaas
nobody   22148     1  0 10:22 ?        00:00:00 haproxy -f /var/lib/neutron/lbaas/e9adbe8b-fbe3-4c1d-9a49-42b6113de190/conf -p /var/lib/neutron/lbaas/e9adbe8b-fbe3-4c1d-9a49-42b6113de190/pid -sf 18150

(3) Unstandby cluster
[root@os3ctrl03 ~]# pcs cluster unstandby --all

(4) Note same HAProxy loadbalancer process is respawned on a new PID
neutron  14529     1 11 10:29 ?        00:00:00 /usr/bin/python /usr/bin/neutron-lbaas-agent --config-file /usr/share/neutron/neutron-dist.conf --config-file /usr/share/neutron/neutron-lbaas-dist.conf --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/lbaas_agent.ini --config-dir /etc/neutron/conf.d/neutron-lbaas-agent --log-file /var/log/neutron/lbaas-agent.log
nobody   14759     1  0 10:29 ?        00:00:00 haproxy -f /var/lib/neutron/lbaas/e9adbe8b-fbe3-4c1d-9a49-42b6113de190/conf -p /var/lib/neutron/lbaas/e9adbe8b-fbe3-4c1d-9a49-42b6113de190/pid -sf 22148

(5) Check network interfaces in the namespace of the loadbalancer.  Note the VIP network interface is missing!
[root@os3ctrl03 neutron(openstack_admin)]# ip netns exec qlbaas-e9adbe8b-fbe3-4c1d-9a49-42b6113de190 ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever

(6) Note restarts of neutron-lbaas-agent do not resolve.