title: Running two jenkins servers projects on one shared node
body: <p>Data:</p>
  <ul>
  <li>different projects built on 2 different Jenkins servers</li>
  <li>one shared node with two slave agents run</li>
  </ul>
  <p>Problem:
  How to make the node 'busy' while one Jenkins is using the node? So far it is possible to run builds on both Jenkins at once...</p>