refactor RabbitMQ Dockerfile

rabbitmq/Dockerfile

@@ -1,12 +1,5 @@
-#
-# RabbitMQ Dockerfile
-#
-# https://github.com/dockerfile/rabbitmq
-#
-
-# Pull base image.
 FROM rabbitmq
 
 RUN rabbitmq-plugins enable --offline rabbitmq_management
 
-EXPOSE 15671 15672
+EXPOSE 15671 15672