Release mistral RC2 for Train

This release is being proposed to pick up translations and bugfixes
that have merged to stable/train but not been released.

Not all changes are critical to make it into the initial Train
coordinated release and can wait until a stable release later. If
this patch does not get an ack from the PTL and/or release liaison
by EOD Thursday it will just be abandoned.

Teams may also choose to -1 this patch and update it once any final
commits merge prior to the October 10 deadline.

Change-Id: Ica81d1eb8b9e566b98ea60bf7d35c81e46611760

deliverables/train/mistral.yaml

@@ -32,6 +32,14 @@ releases:
         hash: 538fc12dff4c6e1171c28e6b49fddbe5371db315
       - repo: openstack/mistral-extra
         hash: 30f737f54e67b903f7f1cd6a5104aca25de500fd
+  - version: 9.0.0.0rc2
+    projects:
+      - repo: openstack/mistral
+        hash: 016509eb5ea673dd66cff04bb457645be1618653
+      - repo: openstack/mistral-dashboard
+        hash: 82df9c6400eb1c5e74c14df16439fcfb5491ddfd
+      - repo: openstack/mistral-extra
+        hash: 559c7ef5a977583dd4f1b931880d4154ebf565b5
 branches:
   - name: stable/train
     location: 9.0.0.0rc1