[barbican] Transition Train to EM

This transition the train 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: Ia022c804bd09ac11499afcc61705cca8d8790761

deliverables/train/barbican.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/barbican
         hash: 07be1986b44191600de8b9bf919bef395c3a8613
+  - version: train-em
+    projects:
+      - repo: openstack/barbican
+        hash: 07be1986b44191600de8b9bf919bef395c3a8613
 branches:
   - name: stable/train
     location: 9.0.0.0rc1

deliverables/train/python-barbicanclient.yaml

@@ -10,6 +10,10 @@ releases:
     projects:
       - repo: openstack/python-barbicanclient
         hash: 9c0e02d367b86eb5bdebda4e0ff1434d70db5f61
+  - version: train-em
+    projects:
+      - repo: openstack/python-barbicanclient
+        hash: 9c0e02d367b86eb5bdebda4e0ff1434d70db5f61
 branches:
   - name: stable/train
     location: 4.9.0