Release ec2-api for Ussuri

RC1 release for ec2-api. Please +1 if things are
ready to go, or -1 if the team needs a little more
time. If so, please update this patch with the new
commit hash to use when ready.

If no response, this patch will be approved soon
after the April 23 deadline.

Change-Id: I267215924a399895e8e2edec107f089834599ba2
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

deliverables/ussuri/ec2-api.yaml

@@ -6,3 +6,11 @@ team: ec2-api
 type: service
 repository-settings:
   openstack/ec2-api: {}
+releases:
+  - version: 10.0.0.0rc1
+    projects:
+      - repo: openstack/ec2-api
+        hash: 21c15aa680caabf3587627dd900469d77d13d9ae
+branches:
+  - name: stable/ussuri
+    location: 10.0.0.0rc1