1146680 - Stop pulp_workers services with SIGQUIT.

https://bugzilla.redhat.com/show_bug.cgi?id=1146680
Merge pull request #1175 from rbarlow/1146680

1146680 - Stop pulp_workers services with SIGQUIT.
Merge branch '2.5-testing' into 2.5-dev
Merge branch '2.5-dev'