[watcher] 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: I4d379dadcef236af4b694340aad5bde0d4e22beb

deliverables/rocky/python-watcherclient.yaml

@@ -23,6 +23,10 @@ releases:
     projects:
       - repo: openstack/python-watcherclient
         hash: 582b52b1b8707f678c16a9f4c1c935b448befda3
+  - version: rocky-em
+    projects:
+      - repo: openstack/python-watcherclient
+        hash: 582b52b1b8707f678c16a9f4c1c935b448befda3
 branches:
   - location: 2.1.0
     name: stable/rocky

deliverables/rocky/watcher-dashboard.yaml

@@ -22,4 +22,8 @@ releases:
     projects:
       - repo: openstack/watcher-dashboard
         hash: 09de59300f97cf099f2749e5e3fa266a542440cb
+  - version: rocky-em
+    projects:
+      - repo: openstack/watcher-dashboard
+        hash: 09de59300f97cf099f2749e5e3fa266a542440cb
 release-notes: https://docs.openstack.org/releasenotes/watcher-dashboard/rocky.html

deliverables/rocky/watcher-tempest-plugin.yaml

@@ -9,6 +9,10 @@ releases:
       - repo: openstack/watcher-tempest-plugin
         hash: 8b78066462a76eba0242e264d3598adbd38eabbc
         tarball-base: watcher-tempest-plugin
+  - version: rocky-em
+    projects:
+      - repo: openstack/watcher-tempest-plugin
+        hash: 8b78066462a76eba0242e264d3598adbd38eabbc
 repository-settings:
   openstack/watcher-tempest-plugin: {}
 team: watcher

deliverables/rocky/watcher.yaml

@@ -34,6 +34,10 @@ releases:
       - repo: openstack/watcher
         hash: a8974556ecc29f09e07f411fb745e61e68d8db92
         tarball-base: python-watcher
+  - version: rocky-em
+    projects:
+      - repo: openstack/watcher
+        hash: a8974556ecc29f09e07f411fb745e61e68d8db92
 cycle-highlights:
   - |
     Watcher services can be launched in HA mode. From now on Watcher Decision