title: Multiline bash command in Jenkins pipeline
body: <p>I have the following sh command in my Jenkinsfile which does not work because it tries to execute the last "DATA" as a command.
  If I move last "DATA" to the beginning of the line it works but is not as beautiful as I want. 
  Is there a way to the indention in this case?</p>
  
  <pre><code>    sh """
          sshpass -p 'password' ssh -o StrictHostKeyChecking=no appsadm@$backup_registry &lt;&lt;DATA
          sudo /etc/init.d/docker stop || true
          sudo yum remove -y docker-engine.x86_64
          sudo rm -fr /var/lib/docker /var/log/docker
          sudo rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm || true
          sudo yum update -y
          sudo yum -y install docker-io
          sudo sed -i 's#other_args=.*#other_args="--insecure-registry $official_registry:5000"#g' /etc/sysconfig/docker
          sudo /etc/init.d/docker start
          DATA
          """
  </code></pre>