[cyborg] 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: I73462e30f3bd17b638d484a8b5aac0be1c23fb33

deliverables/ussuri/cyborg.yaml

@@ -40,6 +40,10 @@ releases:
     projects:
       - repo: openstack/cyborg
         hash: bb718c84204c323f9c2080904f00b83b5f7baf2f
+  - version: ussuri-em
+    projects:
+      - repo: openstack/cyborg
+        hash: bb718c84204c323f9c2080904f00b83b5f7baf2f
 branches:
   - name: stable/ussuri
     location: 4.0.0.0rc1

deliverables/ussuri/python-cyborgclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-cyborgclient
         hash: 40aad6e611ce53bdcaf47f50e33ba5e14dc8b41e
+  - version: ussuri-em
+    projects:
+      - repo: openstack/python-cyborgclient
+        hash: 40aad6e611ce53bdcaf47f50e33ba5e14dc8b41e
 branches:
   - name: stable/ussuri
     location: 1.1.0