[kolla] Transition Rocky to EM

This transition the rocky branch to extended maintenance.
Changes for bugfixes and things the team deems important are
still encouraged, but there will no longer be official releases
off of the branch.

Please +1 if the team is ready for us to proceed with this
transition, or -1 if there are any final backports currently in
flight that we should wait for. For the latter case, please
update the patch with the new commit hash after doing a final
release to get those changes out so we know to proceed with the
transition.

Change-Id: I7823bd1683ba8e6a0397d04df324486613258d04

deliverables/rocky/kolla-ansible.yaml

@@ -58,4 +58,8 @@ releases:
     projects:
       - repo: openstack/kolla-ansible
         hash: 8e33f72dbe80b21652bbdbb184be673c26c4ae99
+  - version: rocky-em
+    projects:
+      - repo: openstack/kolla-ansible
+        hash: 8e33f72dbe80b21652bbdbb184be673c26c4ae99
 release-notes: https://docs.openstack.org/releasenotes/kolla-ansible/rocky.html

deliverables/rocky/kolla.yaml

@@ -58,6 +58,10 @@ releases:
       - repo: openstack/kolla
         hash: 703dedbb7f34c2b7923847943ba88e08b6b69809
     version: 7.1.1
+  - version: rocky-em
+    projects:
+      - repo: openstack/kolla
+        hash: 703dedbb7f34c2b7923847943ba88e08b6b69809
 cycle-highlights:
   - Added new docker images in kolla for logstash, monasca, prometheus,
     ravd, neutron-infoblox-ipam-driver and apache storm.