[tacker] Transition Wallaby to EM

This transition the wallaby 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.

The transition deadline is November 2nd, 2022.

Change-Id: Ia58fd805414e93b2b7b796b3e1609e02951518db

deliverables/wallaby/python-tackerclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-tackerclient
         hash: 4e6dc4c0310f02e3b71941df676674b138081890
+  - version: wallaby-em
+    projects:
+      - repo: openstack/python-tackerclient
+        hash: 4e6dc4c0310f02e3b71941df676674b138081890
 branches:
   - name: stable/wallaby
     location: 1.6.0

deliverables/wallaby/tacker-horizon.yaml

@@ -15,6 +15,10 @@ releases:
       - repo: openstack/tacker-horizon
         hash: 70566f48610c5917f9b24b9804f843a76a4effef
     diff-start: 2.0.0
+  - version: wallaby-em
+    projects:
+      - repo: openstack/tacker-horizon
+        hash: 70566f48610c5917f9b24b9804f843a76a4effef
 branches:
   - name: stable/wallaby
     location: 3.0.0.0rc1

deliverables/wallaby/tacker.yaml

@@ -39,6 +39,10 @@ releases:
       - repo: openstack/tacker
         hash: 098370444733c035a4092ef89eea13594fecd2a3
     diff-start: 4.0.0.0rc1
+  - version: wallaby-em
+    projects:
+      - repo: openstack/tacker
+        hash: 098370444733c035a4092ef89eea13594fecd2a3
 branches:
   - name: stable/wallaby
     location: 5.0.0.0rc1