| erase old builds

[Ryan H. Lewis]

I've got about ~40 builds that are over a day old and dont seem to want to complete. I
really would like to be able to cancel jobs that have already started, or enforce a
timeout on the build jobs that fails them if they take longer than X time.

Here is a list of some of the stale jobs:

479039	elemental	0.87-2.el7.centos	2 hours ago	102 minutes	 running
478917	elemental	0.87-2.el7.centos	24 hours ago	105 minutes	 running
478902	elemental	0.87-2.el7.centos	25 hours ago	2 hours	 failed
478900	elemental	0.87-2.el7.centos	25 hours ago	42 minutes	 failed
478894	elemental	0.87-2.el7.centos	25 hours ago	2 hours	 failed
478890	elemental	0.87-2.el7.centos	26 hours ago	2 hours	 running
478889	elemental	0.87-2.el7.centos	26 hours ago	113 minutes	 running
478870	elemental	0.87-2.el7.centos	27 hours ago	105 minutes	 succeeded
478866	elemental	0.87-2.el7.centos	28 hours ago	105 minutes	 succeeded
478848	elemental	0.87-2.el7.centos	30 hours ago	27 hours	 running
478669	elemental	0.87-2.el7.centos	2 days ago	28 hours	 succeeded
478629	elemental	0.87-2.el7.centos	2 days ago	29 hours	 failed
478627	elemental	0.87-2.el7.centos	2 days ago	31 hours	 failed
478625	elemental	0.87-2.el7.centos	2 days ago	28 hours	 failed
478622	elemental	0.87-2.el7.centos	2 days ago	30 hours	 failed

I've tried asking a few times in #fedora-buildsys, but, I have not been able to see
any responses there. I've been having trouble with IRC.