title: ibmcom/mq docker image backward compatibility issue
body: <p>I was using docker image ibmcom/mq .
  My compose file was:</p>
  
  <pre><code>FROM ibmcom/mq
  USER root
  # create another client user
  # default is app without password
  RUN useradd user1 -G mqclient &amp;&amp; \
  echo user1:passwd | chpasswd
  </code></pre>
  
  <p>Then suddenly it was stopped working when I build latest image again.</p>
  
  <p>Error is :</p>
  
  <pre><code>useradd: group 'mqclient' does not exist
  ERROR: Service 'mq' failed to build: The command '/bin/sh -c useradd user1 -G mqclient &amp;&amp;     echo user1:passwd | chpasswd' returned a non-zero code: 6
  </code></pre>
  
  <p>Now compose is not working with latest image(9.1.5.0-r1) version but works with old version e.g. 9.1.4.0-r1</p>
  
  <p>Can anyone suggest what is the alternative </p>