Add a mechanism to "reset" drupalci.

We should be able to, on an ad-hoc basis, trigger drupalCI to reset itself – shut down all running tests, ensure any queued/unfinished tests go back to the correct status on drupal.org, and restart jenkins. CLeanup from jenkins failures is problematic. This could help.


Source: https://www.drupal.org/project/issues/rss/infrastructure