(bug 44960) Job returns Status instead of bool

Job's abstract function run() expects to return a bool;
ArticleFeedbackv5MailerJob, which extends Job, returned
a status object instead of a boolean though, which was
blatantly "incompatible"

Change-Id: I176813196fa300d92bc0f2ba753bc2808269eae7
Merge "(bug 44960) Job returns Status instead of bool"