Adding API v3 version for horizon

Change-Id: Ica55418fcab05ca629dad133b308f7a07dd0a15e
Related-PROD: PROD-24978
diff --git a/metadata/service/server/cluster.yml b/metadata/service/server/cluster.yml
index 90d2aae..2320576 100644
--- a/metadata/service/server/cluster.yml
+++ b/metadata/service/server/cluster.yml
@@ -37,6 +37,8 @@
           port: 11211
         - host: ${_param:cluster_node03_address}
           port: 11211
+      api_versions:
+        identity: ${_param:horizon_identity_version}
       identity:
         engine: keystone
         port: 5000