[octavia] 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: Ia2af5977a8a8ab4dc5149683d02b848702a26845

deliverables/rocky/octavia-dashboard.yaml

@@ -46,6 +46,10 @@ releases:
     projects:
       - repo: openstack/octavia-dashboard
         hash: 0e14846f712fedfdc8b56686bde2114d26b241fe
+  - version: rocky-em
+    projects:
+      - repo: openstack/octavia-dashboard
+        hash: 0e14846f712fedfdc8b56686bde2114d26b241fe
 branches:
   - location: 2.0.0.0rc1
     name: stable/rocky