fix rabbitmq config

- since we are using distro_packages for rabbitmq the default rabbitmq
  config name is broken overriding this attribute fixes this

Change-Id: Ia732d5ac4c64eab2126bbc385998585c96ff23d9

attributes/default.rb

@@ -28,6 +28,7 @@ default['openstack']['mq']['search_for_cluster_disk_nodes'] = true
 
 if platform_family?('debian', 'suse')
   override['rabbitmq']['use_distro_version'] = true
+  normal['rabbitmq']['config'] = '/etc/rabbitmq/rabbitmq.config'
 end
 
 # Enable the rabbitmq management plugin by default