Release trove 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: Ib355466077e0c8166db09e69fdb3951755104173

deliverables/train/trove.yaml

@@ -20,6 +20,10 @@ releases:
     projects:
       - repo: openstack/trove
         hash: 59be66ceaacba7be038ff17817fa6bd8e0aed4ec
+  - version: 12.0.0.0rc2
+    projects:
+      - repo: openstack/trove
+        hash: 6bfa510194e3cf30c8c03446d435edd87c1b4d23
 branches:
   - name: stable/train
     location: 12.0.0.0rc1