[solum] 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: If1f7ca99a1a0de10729ad3f84826ed8f58b8bce1

deliverables/stein/python-solumclient.yaml

@@ -10,6 +10,10 @@ releases:
       - hash: 977717e756a6f4479480474777d2931c4860e7a6
         repo: openstack/python-solumclient
     version: 2.8.0
+  - version: stein-em
+    projects:
+      - repo: openstack/python-solumclient
+        hash: 977717e756a6f4479480474777d2931c4860e7a6
 branches:
   - location: 2.8.0
     name: stable/stein

deliverables/stein/solum-dashboard.yaml

@@ -10,6 +10,10 @@ releases:
     projects:
       - repo: openstack/solum-dashboard
         hash: 77c4c65f093b104748f6b60768ad0eb7c1d84586
+  - version: stein-em
+    projects:
+      - repo: openstack/solum-dashboard
+        hash: 77c4c65f093b104748f6b60768ad0eb7c1d84586
 branches:
   - location: 2.6.0
     name: stable/stein

deliverables/stein/solum.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/solum
         hash: c9d7760774ed7a749831592e426e14c6b5fba033
+  - version: stein-em
+    projects:
+      - repo: openstack/solum
+        hash: c9d7760774ed7a749831592e426e14c6b5fba033
 branches:
   - location: 6.0.0.0rc1
     name: stable/stein