#285 Stop mapping ProxySQL admin port 127.0.0.1 interface

The reason for which I was trying to do this was that it wasn't being
correctly forwarded by Docker. It works correctly if I bind the
forwarded port to 0.0.0.0 instead of 127.0.0.1 on the original
container.

docker/1backend/docker-compose.yml

@@ -3,7 +3,7 @@ proxysql:
   links:
     - backend1hostgroup0
   ports:
-    - "127.0.0.1:6032:6032"
+    - "6032:6032"
     - "6033:6033"
 
 backend1hostgroup0: