title: Issue with stage's directory in parallel steps on Jenkins Pipeline
body: <p>I have an issue with Jenkins Pipeline. I have two application that i want to checkout and test in parallel : </p>
  
  <pre><code>pipeline {
      agent none
      stages {
          stage('Build') {
              parallel {
                 stage('First app') {
                     agent any
                     steps {
                          echo "checkout first app"
                      }
                 }
                 stage('Second app') {
                     agent any
                     steps {
                          echo "checkout second app"
                     }
                 }
              }
           }
           stage('Test') {
               parallel {
                  stage('First app') {
                      agent any
                      steps {
                          echo 'test First app'
                      }
                      post {
                          always {
                              junit 'build/*.xml'
                          }
                      }
                  }
                  stage('Second app') {
                      agent any
                      steps {
                          echo "test second app"
                      }
                      post {
                          failure {
                               echo "failure"
                          }
                      }
                  }
              }
          }
          stage('Deploy') {
              echo "Deploy all
          }
      }
  }
  </code></pre>
  
  <p>I don't understand exactly how it works, because it says : </p>
  
  <pre><code>[First app] Running on maître in /var/lib/jenkins/workspace/My Project
  [Second app] Running on maître in /var/lib/jenkins/workspace/My Project@2
  </code></pre>
  
  <p>But in the Test stage workspace switch : </p>
  
  <pre><code>[Second app] Running on maître in /var/lib/jenkins/workspace/My Project
  [First app] Running on maître in /var/lib/jenkins/workspace/My Project@2
  </code></pre>
  
  <p>So my test's stage is not relevant.</p>
  
  <p>What can i do in order to fix this problem?</p>