message: Jenkinsfile: Fix get_stages
diff: #!groovy
  def get_stages(ros_distribution, ubuntu_version) {
  + return {
  node('docker') {
  step([$class: 'StashNotifier'])
  @@ -54,6 +55,7 @@ def get_stages(ros_distribution, ubuntu_version) {
  }
  }
  }
  +}
  parallel(
  'kinetic': get_stages('kinetic', 'xenial'),
  