Initial VIP ipv6 minor update code

Initial VIP ipv6 minor update code

To test this change we deployed a stock master with ipv6 which created a bunch
of ipv6 with /64 netmask:
[root@overcloud-controller-0 ~]# pcs resource show ip-fd00.fd00.fd00.2000..18
 Resource: ip-fd00.fd00.fd00.2000..18 (class=ocf provider=heartbeat type=IPaddr2)
  Attributes: ip=fd00:fd00:fd00:2000::18 cidr_netmask=64
  Operations: start interval=0s timeout=20s (ip-fd00.fd00.fd00.2000..18-start-interval-0s)
              stop interval=0s timeout=20s (ip-fd00.fd00.fd00.2000..18-stop-interval-0s)
              monitor interval=10s timeout=20s (ip-fd00.fd00.fd00.2000..18-monitor-interval-10s)

Then we update the THT folder with this patch and upload the new scripts on the undercloud via:
openstack overcloud deploy --update-plan-only ....

Then we kick off the minor update workflow:
openstack overcloud update stack -i overcloud

Once the controller-0 node (bootstrap node for pacemaker) is completed we have the
correct VIP configuration:
[root@overcloud-controller-0 heat-config-script]# pcs resource show ip-fd00.fd00.fd00.2000..18
 Resource: ip-fd00.fd00.fd00.2000..18 (class=ocf provider=heartbeat type=IPaddr2)
  Attributes: ip=fd00:fd00:fd00:2000::18 cidr_netmask=128 nic=vlan20 lvs_ipv6_addrlabel=true lvs_ipv6_addrlabel_value=99
  Operations: start interval=0s timeout=20s (ip-fd00.fd00.fd00.2000..18-start-interval-0s)
              stop interval=0s timeout=20s (ip-fd00.fd00.fd00.2000..18-stop-interval-0s)
              monitor interval=10s timeout=20s (ip-fd00.fd00.fd00.2000..18-monitor-interval-10s)

Also verified that running the script a second time does not alter the
(already fixed) VIPs.

Co-Authored-By: Damien Ciabrini <dciabrin@redhat.com>
Change-Id: I765cd5c9b57134dff61f67ce726bf88af90f8090
(cherry picked from commit 4923f5c4991bd539888b4175fae20025d6ef3957)