[magnum] 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: I96f9486a547194219bb87b2ae123fad53eaea810

deliverables/train/magnum-ui.yaml

@@ -22,6 +22,10 @@ releases:
     projects:
       - repo: openstack/magnum-ui
         hash: 7e10a6aec2adb7c6ec740f873c616522a0ee7be5
+  - version: train-em
+    projects:
+      - repo: openstack/magnum-ui
+        hash: 7e10a6aec2adb7c6ec740f873c616522a0ee7be5
 branches:
   - name: stable/train
     location: 5.2.0

deliverables/train/magnum.yaml

@@ -25,10 +25,10 @@ cycle-highlights:
     to choose between a private cluster by default and only allow access
     to the API exposed on Internet or make it fully accessible.
   - Add ``cinder_csi_enabled`` label to support out of tree Cinder CSI.
-  - Support ``containerd`` as a ``container_runtime`` as an alternative to
-    ``host-docker``.
-  - A new config ``health_polling_interval`` is supported to make the interval
-    configurable or disable completely.
+  - Support ``containerd`` as a ``container_runtime`` as an alternative
+    to ``host-docker``.
+  - A new config ``health_polling_interval`` is supported to make the
+    interval configurable or disable completely.
 releases:
   - version: 9.0.0.0rc1
     projects:
@@ -63,6 +63,10 @@ releases:
     projects:
       - repo: openstack/magnum
         hash: 528ec941da294b454221170e1919b7dc18d10e86
+  - version: train-em
+    projects:
+      - repo: openstack/magnum
+        hash: 528ec941da294b454221170e1919b7dc18d10e86
 branches:
   - name: stable/train
     location: 9.0.0.0rc1

deliverables/train/python-magnumclient.yaml

@@ -23,6 +23,10 @@ releases:
       - repo: openstack/python-magnumclient
         hash: 8106c5ff0020aefd755af66cdf8f2c49bb68f969
     version: 2.16.0
+  - version: train-em
+    projects:
+      - repo: openstack/python-magnumclient
+        hash: 8106c5ff0020aefd755af66cdf8f2c49bb68f969
 branches:
   - name: stable/train
     location: 2.15.0