[zun] 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: I4716f20d70c3db9f49bf544a9aabfdd01dd2e8f7

deliverables/ussuri/python-zunclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-zunclient
         hash: d26adc61c0afbc5e6eaae5108200fef8e8c7185b
+  - version: ussuri-em
+    projects:
+      - repo: openstack/python-zunclient
+        hash: d26adc61c0afbc5e6eaae5108200fef8e8c7185b
 branches:
   - name: stable/ussuri
     location: 4.0.0

deliverables/ussuri/zun-ui.yaml

@@ -15,6 +15,10 @@ releases:
       - repo: openstack/zun-ui
         hash: 08e0830f356f80aa4e0797aa877943cd319fae5c
     diff-start: 4.0.0
+  - version: ussuri-em
+    projects:
+      - repo: openstack/zun-ui
+        hash: 08e0830f356f80aa4e0797aa877943cd319fae5c
 branches:
   - name: stable/ussuri
     location: 5.0.0.0rc1

deliverables/ussuri/zun.yaml

@@ -24,6 +24,10 @@ releases:
     projects:
       - repo: openstack/zun
         hash: 5d41a395f0b8a02c7c5970f4b54d77c22d548986
+  - version: ussuri-em
+    projects:
+      - repo: openstack/zun
+        hash: 5d41a395f0b8a02c7c5970f4b54d77c22d548986
 branches:
   - name: stable/ussuri
     location: 5.0.0.0rc1