[trove] 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: I6568b9ee6d8957b1d4827dbaaf5ac3192d7140e4

deliverables/ussuri/python-troveclient.yaml

@@ -27,6 +27,10 @@ releases:
     projects:
       - repo: openstack/python-troveclient
         hash: 1feaf3673c6499805215dc4f5212af6f2f1284fa
+  - version: ussuri-em
+    projects:
+      - repo: openstack/python-troveclient
+        hash: 1feaf3673c6499805215dc4f5212af6f2f1284fa
 branches:
   - name: stable/ussuri
     location: 3.3.1

deliverables/ussuri/trove-dashboard.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/trove-dashboard
         hash: db7a5abd655d871cc036a4b59eeb4225f028e2da
+  - version: ussuri-em
+    projects:
+      - repo: openstack/trove-dashboard
+        hash: db7a5abd655d871cc036a4b59eeb4225f028e2da
 branches:
   - name: stable/ussuri
     location: 14.0.0.0rc1

deliverables/ussuri/trove.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/trove
         hash: 48e39a07a60c9a7ce9b2fbfcc97a16bc2c56723f
+  - version: ussuri-em
+    projects:
+      - repo: openstack/trove
+        hash: 48e39a07a60c9a7ce9b2fbfcc97a16bc2c56723f
 branches:
   - name: stable/ussuri
     location: 13.0.0.0rc1