Merge pull request #2310 from angstwad/fix-rabbitmq-user

Fix Traceback on rabbitmq_user when "node" argument is used

messaging/rabbitmq_user.py

@@ -146,7 +146,7 @@ class RabbitMqUser(object):
         if not self.module.check_mode or (self.module.check_mode and run_in_check_mode):
             cmd = [self._rabbitmqctl, '-q']
             if self.node is not None:
-                cmd.append(['-n', self.node])
+                cmd.extend(['-n', self.node])
             rc, out, err = self.module.run_command(cmd + args, check_rc=True)
             return out.splitlines()
         return list()