[OpenStackSDK] Transition Xena to EM

This transition the stable/xena 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 after the transition.

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.

The transition deadline is April 20th, 2023.

Change-Id: I31d1284479900be78d5be2bf3e1c3cdb121430a5

deliverables/xena/cliff.yaml

@@ -15,6 +15,10 @@ releases:
     projects:
       - repo: openstack/cliff
         hash: 734bc0c5da6915f10823a3124e08ba3ddbd4cc63
+  - version: xena-em
+    projects:
+      - repo: openstack/cliff
+        hash: 734bc0c5da6915f10823a3124e08ba3ddbd4cc63
 branches:
   - name: stable/xena
     location: 3.9.0

deliverables/xena/openstacksdk.yaml

@@ -23,6 +23,10 @@ releases:
     projects:
       - repo: openstack/openstacksdk
         hash: d0d4d8bc64da62dc8338e307b4f736cd0b1f5f49
+  - version: xena-em
+    projects:
+      - repo: openstack/openstacksdk
+        hash: d0d4d8bc64da62dc8338e307b4f736cd0b1f5f49
 branches:
   - name: feature/r1
     location:

deliverables/xena/osc-lib.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/osc-lib
         hash: 415a6c7b191ac665fb7763d12d1b427b7b630586
+  - version: xena-em
+    projects:
+      - repo: openstack/osc-lib
+        hash: 415a6c7b191ac665fb7763d12d1b427b7b630586
 branches:
   - name: stable/xena
     location: 2.4.2

deliverables/xena/python-openstackclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-openstackclient
         hash: e6da07b977fab75f087827c764d63deb8a8f9d04
+  - version: xena-em
+    projects:
+      - repo: openstack/python-openstackclient
+        hash: e6da07b977fab75f087827c764d63deb8a8f9d04
 branches:
   - name: stable/xena
     location: 5.6.0