[karbor] Transition Stein to EM

This transition the stein 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: Ib5a6faf8bbf1b3bb0bc7610766a12f424edb0cd4

deliverables/stein/karbor-dashboard.yaml

@@ -18,3 +18,7 @@ releases:
       - hash: 5c279133d56921a679856fa0f1476ef4f486e345
         repo: openstack/karbor-dashboard
     version: 1.2.1
+  - version: stein-em
+    projects:
+      - repo: openstack/karbor-dashboard
+        hash: 5c279133d56921a679856fa0f1476ef4f486e345

deliverables/stein/karbor.yaml

@@ -24,3 +24,7 @@ releases:
       - hash: 1deb153e53f63530be24102d6e84d939444c0893
         repo: openstack/karbor
     version: 1.3.0
+  - version: stein-em
+    projects:
+      - repo: openstack/karbor
+        hash: 1deb153e53f63530be24102d6e84d939444c0893

deliverables/stein/python-karborclient.yaml

@@ -11,6 +11,10 @@ releases:
       - hash: 3216f64d14167c0330e9b96606f19d113007e303
         repo: openstack/python-karborclient
     version: 1.2.0
+  - version: stein-em
+    projects:
+      - repo: openstack/python-karborclient
+        hash: 3216f64d14167c0330e9b96606f19d113007e303
 branches:
   - location: 1.2.0
     name: stable/stein