[DO NOT MERGE] Comps - Adding delayed_job_active_record needed to properly hook up

the active_record backend to delayed_job > 3.0.

@xsuchy Fedora18 contains delayed_job 3.0.2 but they didn't package the delayed_job_active_record gem which is needed to wire things up properly.  I have built this gem for F18 and tagged it into koji already and pushed the updates to katello-thirdparty git. We will need to do the same for the SCL, building delayed_job and delayed_job_active_record but I wasn't able to get the prefix working right when trying to tag the SCL versions.  If you could have a look in the morning and if this PR is accurate, ACK and merge at your leisure.