[glance] Transition Ussuri to EM

This transition the ussuri 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: I85033f964054d24e8ffec6b9f7c482ddab291c5f

deliverables/ussuri/glance-store.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/glance_store
         hash: ca0c58b52756058b6d51bf6a47aeac3d525c1e16
+  - version: ussuri-em
+    projects:
+      - repo: openstack/glance_store
+        hash: ca0c58b52756058b6d51bf6a47aeac3d525c1e16
 branches:
   - location: 2.0.0
     name: stable/ussuri

deliverables/ussuri/glance.yaml

@@ -51,6 +51,10 @@ releases:
     projects:
       - repo: openstack/glance
         hash: e11b0e74001fbf6e1cd906d8c0cc3a9758de52c6
+  - version: ussuri-em
+    projects:
+      - repo: openstack/glance
+        hash: e11b0e74001fbf6e1cd906d8c0cc3a9758de52c6
 branches:
   - name: stable/ussuri
     location: 20.0.0.0rc1

deliverables/ussuri/python-glanceclient.yaml

@@ -23,6 +23,10 @@ releases:
     projects:
       - repo: openstack/python-glanceclient
         hash: 4c63903403d7ef7801c8e274b67f9647ff329991
+  - version: ussuri-em
+    projects:
+      - repo: openstack/python-glanceclient
+        hash: 4c63903403d7ef7801c8e274b67f9647ff329991
 branches:
   - location: 3.1.0
     name: stable/ussuri