RabbitMQ: Dont remove definitions.json and erlang cookie when resetting

This PS udpated the reset node function to leave the assets generated
via init containers in place when resetting the node.

Change-Id: Iac52ca82e95bb372dbcbca0eeea3b262215e9c12
Signed-off-by: Pete Birley <pete@port.direct>

rabbitmq/templates/bin/_rabbitmq-start.sh.tpl

@@ -64,7 +64,7 @@ if ! [ "${POD_INCREMENT}" -eq "0" ] && ! [ -d "/var/lib/rabbitmq/mnesia" ] ; the
 
   function reset_rabbit () {
     rabbitmqctl shutdown || true
-    rm -rf /var/lib/rabbitmq/*
+    find /var/lib/rabbitmq/ ! -name 'definitions.json' ! -name '.erlang.cookie' -exec rm -rf {} +
     exit 1
   }