[nova] 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: Ifa5981dccbd04460ecf31c90b6e4d2cd178b6e26

deliverables/ussuri/nova.yaml

@@ -77,6 +77,10 @@ releases:
     projects:
       - repo: openstack/nova
         hash: 6667fcb92bfaf03a8a274dc26806c137aace6b49
+  - version: ussuri-em
+    projects:
+      - repo: openstack/nova
+        hash: 6667fcb92bfaf03a8a274dc26806c137aace6b49
 branches:
   - name: stable/ussuri
     location: 21.0.0.0rc1

deliverables/ussuri/os-vif.yaml

@@ -16,6 +16,10 @@ releases:
     projects:
       - repo: openstack/os-vif
         hash: 1bd6ef387b759b4a6fb9c793b8a46592461dad22
+  - version: ussuri-em
+    projects:
+      - repo: openstack/os-vif
+        hash: 1bd6ef387b759b4a6fb9c793b8a46592461dad22
 branches:
   - name: stable/ussuri
     location: 2.0.0

deliverables/ussuri/osc-placement.yaml

@@ -15,6 +15,10 @@ releases:
     projects:
       - repo: openstack/osc-placement
         hash: 1d6cb4cf0c49728b28191527ded74709128939bc
+  - version: ussuri-em
+    projects:
+      - repo: openstack/osc-placement
+        hash: 1d6cb4cf0c49728b28191527ded74709128939bc
 branches:
   - name: stable/ussuri
     location: 2.0.0

deliverables/ussuri/placement.yaml

@@ -26,6 +26,10 @@ releases:
     projects:
       - repo: openstack/placement
         hash: de030ef7a78b1b9ee2da75552d1edc829f830aa4
+  - version: ussuri-em
+    projects:
+      - repo: openstack/placement
+        hash: de030ef7a78b1b9ee2da75552d1edc829f830aa4
 branches:
   - name: stable/ussuri
     location: 3.0.0.0rc1

deliverables/ussuri/python-novaclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-novaclient
         hash: 437d63de296f387d0556527bbe9fc97969a2e3db
+  - version: ussuri-em
+    projects:
+      - repo: openstack/python-novaclient
+        hash: 437d63de296f387d0556527bbe9fc97969a2e3db
 branches:
   - name: stable/ussuri
     location: 17.0.0