Add Redis settings to Sensu

Sensu needs to use the VIP address to connect to Redis.

Change-Id: Iab74f6b463e30ca647f2a28f23b75463906a8c85
diff --git a/sensu/server/cluster.yml b/sensu/server/cluster.yml
index 28eb78b..81de8f0 100644
--- a/sensu/server/cluster.yml
+++ b/sensu/server/cluster.yml
@@ -11,6 +11,13 @@
     rabbitmq_cold_password: password
     rabbitmq_monitor_password: password
     sensu_message_queue_host: ${_param:cluster_vip_address}
+    cluster_redis_port: 6379
+  sensu:
+   server:
+     database:
+       engine: redis
+       host: ${_param:cluster_vip_address}
+       port: ${_param:cluster_redis_port}
   rabbitmq:
     cluster:
       name: 'monitoring'