[vitrage] 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: I0a6846a7d486878caa454de110d3dd4b7ac2104c

deliverables/stein/python-vitrageclient.yaml

@@ -23,6 +23,10 @@ releases:
       - hash: 5d6673e343a47fc4cf90e53b2e6e9fa37d7f601c
         repo: openstack/python-vitrageclient
     version: 2.7.0
+  - version: stein-em
+    projects:
+      - repo: openstack/python-vitrageclient
+        hash: 5d6673e343a47fc4cf90e53b2e6e9fa37d7f601c
 branches:
   - location: 2.7.0
     name: stable/stein

deliverables/stein/vitrage-dashboard.yaml

@@ -22,6 +22,10 @@ releases:
     projects:
       - repo: openstack/vitrage-dashboard
         hash: 1413c948c58174dfe58c7f80b93c1126a1466812
+  - version: stein-em
+    projects:
+      - repo: openstack/vitrage-dashboard
+        hash: 1413c948c58174dfe58c7f80b93c1126a1466812
 branches:
   - location: 1.9.0
     name: stable/stein

deliverables/stein/vitrage.yaml

@@ -30,6 +30,10 @@ releases:
     projects:
       - repo: openstack/vitrage
         hash: c3aaf5042f3ea33ddc66d093f63c3fe826f167ff
+  - version: stein-em
+    projects:
+      - repo: openstack/vitrage
+        hash: c3aaf5042f3ea33ddc66d093f63c3fe826f167ff
 branches:
   - location: 4.3.0
     name: stable/stein