Release congress-dashboard for Ussuri

RC1 release for congress-dashboard. 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: I170156e594a899365e24094de6d4e57467fb9a55
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

deliverables/ussuri/congress-dashboard.yaml

@@ -6,3 +6,11 @@ type: horizon-plugin
 release-type: python-pypi
 repository-settings:
   openstack/congress-dashboard: {}
+releases:
+  - version: 6.0.0.0rc1
+    projects:
+      - repo: openstack/congress-dashboard
+        hash: e298ddce8a91bb88a2b8ef15777eed02e23c7365
+branches:
+  - name: stable/ussuri
+    location: 6.0.0.0rc1