[designate] 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: I35a7b38ddb403f22f25c8229913436e22457758f

deliverables/stein/designate-dashboard.yaml

@@ -16,6 +16,10 @@ releases:
       - hash: ffadf3868f3edd22cffb880591cd41710e685377
         repo: openstack/designate-dashboard
     version: 8.0.0
+  - version: stein-em
+    projects:
+      - repo: openstack/designate-dashboard
+        hash: ffadf3868f3edd22cffb880591cd41710e685377
 branches:
   - location: 8.0.0.0rc1
     name: stable/stein

deliverables/stein/designate.yaml

@@ -27,6 +27,10 @@ releases:
     projects:
       - repo: openstack/designate
         hash: 6307c84e83530ab27124ab9e6a8117ee44069614
+  - version: stein-em
+    projects:
+      - repo: openstack/designate
+        hash: 6307c84e83530ab27124ab9e6a8117ee44069614
 branches:
   - location: 8.0.0.0rc1
     name: stable/stein

deliverables/stein/python-designateclient.yaml

@@ -11,6 +11,10 @@ releases:
       - hash: f0b7eb4d8c90ef516174538025629d8458d4180b
         repo: openstack/python-designateclient
     version: 2.11.0
+  - version: stein-em
+    projects:
+      - repo: openstack/python-designateclient
+        hash: f0b7eb4d8c90ef516174538025629d8458d4180b
 branches:
   - location: 2.11.0
     name: stable/stein