Release searchlight 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: I2cc3f1dbf9f08b50208ee2ac108d8dd2c581214d

deliverables/train/searchlight.yaml

@@ -10,6 +10,10 @@ releases:
     projects:
       - repo: openstack/searchlight
         hash: ec7baccfc4fbf1726d17f763d315604f2f242ae7
+  - version: 7.0.0.0rc2
+    projects:
+      - repo: openstack/searchlight
+        hash: 5aeee08c44091b93b7619b48d389af4833016337
 branches:
   - name: stable/train
     location: 7.0.0.0rc1