Shut down rabbitmq-server when shutting down all services.

Fixes bug 978205.

Change-Id: I688887e4b4426db36438f2bf0e537956f4f94757
diff --git a/unstack.sh b/unstack.sh
index e73cc2d..30ee512 100755
--- a/unstack.sh
+++ b/unstack.sh
@@ -67,6 +67,11 @@
     if is_service_enabled mysql; then
         stop_service mysql
     fi
+
+    # Stop rabbitmq-server
+    if is_service_enabled rabbit; then
+        stop_service rabbitmq-server
+    fi
 fi
 
 # Quantum dhcp agent runs dnsmasq