[swift] 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: Idad3d334f9eaadb8df93d44b854d5f74f3bee734

deliverables/ussuri/python-swiftclient.yaml

@@ -15,6 +15,10 @@ releases:
     projects:
       - repo: openstack/python-swiftclient
         hash: 3673cc0e88517f33e18655d9d861bb1366a0b19a
+  - version: ussuri-em
+    projects:
+      - repo: openstack/python-swiftclient
+        hash: 3673cc0e88517f33e18655d9d861bb1366a0b19a
 branches:
   - name: stable/ussuri
     location: 3.9.0

deliverables/ussuri/swift.yaml

@@ -22,6 +22,10 @@ releases:
     projects:
       - repo: openstack/swift
         hash: 4b0d6a87e9b2d0a032fe3b3a85e6fef0e5e8839f
+  - version: ussuri-em
+    projects:
+      - repo: openstack/swift
+        hash: 4b0d6a87e9b2d0a032fe3b3a85e6fef0e5e8839f
 branches:
   - name: stable/ussuri
     location: 2.25.0