Tag and branch monasca-thresh

No commits have been merged to this repo since the train development
cycle, but in order for use to have a point to branch stable/ussuri,
this creates a new release tag off of the same commit as the last train
one and branches from there.

Change-Id: Ic8407576a92398df2eb9de8c5b6bc665ef864a11
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

deliverables/ussuri/monasca-thresh.yaml

@@ -7,3 +7,11 @@ team: monasca
 type: other
 repository-settings:
   openstack/monasca-thresh: {}
+releases:
+  - version: 2.7.0
+    projects:
+      - repo: openstack/monasca-thresh
+        hash: d400f7a2bb41aac6bd1a64add1565148e5439535
+branches:
+  - name: stable/ussuri
+    location: 2.7.0