[watcher] Transition Stein to EM

This transition the stein 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: I44c7893443654e312abfec74cf93966ceedd4be2

deliverables/stein/python-watcherclient.yaml

@@ -11,6 +11,10 @@ releases:
       - hash: db7a5e4bc9c46041228f1dd99fab353c41282761
         repo: openstack/python-watcherclient
     version: 2.2.0
+  - version: stein-em
+    projects:
+      - repo: openstack/python-watcherclient
+        hash: db7a5e4bc9c46041228f1dd99fab353c41282761
 branches:
   - location: 2.2.0
     name: stable/stein

deliverables/stein/watcher-dashboard.yaml

@@ -11,6 +11,10 @@ releases:
     projects:
       - repo: openstack/watcher-dashboard
         hash: 50437a47e418beff01038d92eed2d65714e50137
+  - version: stein-em
+    projects:
+      - repo: openstack/watcher-dashboard
+        hash: 50437a47e418beff01038d92eed2d65714e50137
 branches:
   - location: 1.12.0
     name: stable/stein

deliverables/stein/watcher.yaml

@@ -16,6 +16,10 @@ releases:
       - hash: 922783a5f8b30dbd7e2da95f29ce8e747b812c19
         repo: openstack/watcher
     version: 2.0.0
+  - version: stein-em
+    projects:
+      - repo: openstack/watcher
+        hash: 922783a5f8b30dbd7e2da95f29ce8e747b812c19
 branches:
   - location: 2.0.0.0rc1
     name: stable/stein