[watcher] 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: I83e3f7a8e55d68d664ff0ff71398de4ba4149361

deliverables/train/python-watcherclient.yaml

@@ -15,6 +15,10 @@ releases:
     projects:
       - repo: openstack/python-watcherclient
         hash: 62fdb73dae226ae812c756e98969f8db215b901a
+  - version: train-em
+    projects:
+      - repo: openstack/python-watcherclient
+        hash: 62fdb73dae226ae812c756e98969f8db215b901a
 branches:
   - location: 2.4.0
     name: stable/train

deliverables/train/watcher-dashboard.yaml

@@ -16,6 +16,10 @@ releases:
       - repo: openstack/watcher-dashboard
         hash: e0405ceff6d3499e8f3786df9d678ffaab6ad95f
     diff-start: 1.12.0
+  - version: train-em
+    projects:
+      - repo: openstack/watcher-dashboard
+        hash: e0405ceff6d3499e8f3786df9d678ffaab6ad95f
 branches:
   - name: stable/train
     location: 2.0.0.0rc1

deliverables/train/watcher.yaml

@@ -42,6 +42,10 @@ releases:
     projects:
       - repo: openstack/watcher
         hash: 70a24cb009e3318c55ca94727f5f6325dc3c8db6
+  - version: train-em
+    projects:
+      - repo: openstack/watcher
+        hash: 70a24cb009e3318c55ca94727f5f6325dc3c8db6
 branches:
   - name: stable/train
     location: 3.0.0.0rc1