[zun] 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: I77e67d1b88ebd9228cb41eea2d758b377d2e748e

deliverables/train/python-zunclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-zunclient
         hash: 361634d1e130504b54ade4cc80c06ea0b1cc80d6
+  - version: train-em
+    projects:
+      - repo: openstack/python-zunclient
+        hash: 361634d1e130504b54ade4cc80c06ea0b1cc80d6
 branches:
   - location: 3.5.0
     name: stable/train

deliverables/train/zun-ui.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/zun-ui
         hash: 344217a57753210cd6000208417ccd8252c1eedd
+  - version: train-em
+    projects:
+      - repo: openstack/zun-ui
+        hash: 344217a57753210cd6000208417ccd8252c1eedd
 branches:
   - location: 4.0.0.0rc1
     name: stable/train

deliverables/train/zun.yaml

@@ -23,6 +23,10 @@ releases:
     projects:
       - repo: openstack/zun
         hash: a3b0a0829feed3560abf90f00dbea0ca40387d5f
+  - version: train-em
+    projects:
+      - repo: openstack/zun
+        hash: a3b0a0829feed3560abf90f00dbea0ca40387d5f
 branches:
   - location: 4.0.0.0rc1
     name: stable/train