Add existing RefStack tags

Add refstack.yaml file to the _independent directory to use the
release team's automated releaes processes.

Change-Id: Ia235a5e879ca429bab3838f784de52eef0cad725

deliverables/_independent/refstack.yaml

@@ -0,0 +1,21 @@
+---
+launchpad: refstack
+send-announcements-to: defcore-committee@lists.openstack.org
+
+releases:
+  - version: 1.0.0
+    projects:
+      - repo: openstack/refstack
+        hash: c67c689b642260f4b61c48f7e9df517c5bda930a
+  - version: 1.0.1
+    projects:
+      - repo: openstack/refstack
+        hash: 2895164a84ac71f48791c360be68d79007dc9fec
+  - version: 1.0.2
+    projects:
+      - repo: openstack/refstack
+        hash: 44ae77e2fa7ee1805f38cb4b7f71a0c92f441e2e
+  - version: 1.0.3
+    projects:
+      - repo: openstack/refstack
+        hash: c78ce638e3a51dbb62d333a2e0a6595b5e2a42af