[glance] 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: I8311567a5b4a2af6cbf7eee5a83cbef87a6296bd

deliverables/stein/glance-store.yaml

@@ -19,6 +19,10 @@ releases:
       - hash: 27e421af26cd1bcc68746a0beadb541fb8d647be
         repo: openstack/glance_store
     version: 0.28.1
+  - version: stein-em
+    projects:
+      - repo: openstack/glance_store
+        hash: 27e421af26cd1bcc68746a0beadb541fb8d647be
 branches:
   - location: 0.28.0
     name: stable/stein

deliverables/stein/glance.yaml

@@ -31,4 +31,8 @@ releases:
       - hash: 149ea050cc58f39eaf9b4660bb8f0271b99d03da
         repo: openstack/glance
     version: 18.0.1
+  - version: stein-em
+    projects:
+      - repo: openstack/glance
+        hash: 149ea050cc58f39eaf9b4660bb8f0271b99d03da
 release-notes: https://docs.openstack.org/releasenotes/glance/stein.html

deliverables/stein/python-glanceclient.yaml

@@ -19,6 +19,10 @@ releases:
       - hash: 44a4dbd6ce2642daeaca9f45ac99e2d1b39e805a
         repo: openstack/python-glanceclient
     version: 2.16.0
+  - version: stein-em
+    projects:
+      - repo: openstack/python-glanceclient
+        hash: 44a4dbd6ce2642daeaca9f45ac99e2d1b39e805a
 branches:
   - location: 2.16.0
     name: stable/stein