title: How to create groups of jobs in Jenkins?
body: <p>I have some projects that can be divided into two groups. First group are big building jobs, that can last many hours, the second one are application modules that are being built fairly quickly.<br>
  What I want to do, is to tell Jenkins to build only one task from group one, and at the same time it should be possible to build concurrently tasks from the secon, fast-building group. This would allow concurrent group building without need to wait for long running task to finish. <br>
  Is there a plugin for such things? I've tried Throttle Concurrent Builds, but it executes concurrently many tasks from long running group, occupying all executors.</p>