title: Jenkins pipeline git command submodule update
body: <p>I want to update submodule on git clone.</p>
  
  <p>Is there a way to do this with Jenkins pipeline Git command?</p>
  
  <p>Currently I'm doing this...</p>
  
  <pre><code>git branch: 'master',
      credentialsId: 'bitbucket',
      url: 'ssh://bitbucket.org/hello.git'
  </code></pre>
  
  <p>It doesn't however update submodule once cloned</p>