Bind Sensu to the management address

Otherwise Sensu binds to 0.0.0.0 and it will fail to start if HAProxy
is already running.

Change-Id: I68a6376c52a6975815d580bb4eb91cd5dad159bb
diff --git a/sensu/server/cluster.yml b/sensu/server/cluster.yml
index 81de8f0..5c8fe85 100644
--- a/sensu/server/cluster.yml
+++ b/sensu/server/cluster.yml
@@ -14,6 +14,8 @@
     cluster_redis_port: 6379
   sensu:
    server:
+     bind:
+       address: ${_param:single_address}
      database:
        engine: redis
        host: ${_param:cluster_vip_address}