Bug 1284289 - Clarify celery retry call behaviour with 'raise' prefix
Bug 1284289 - Clarify celery retry call behaviour with 'raise' prefix

As recommended by:
http://docs.celeryproject.org/en/stable/reference/celery.app.task.html#celery.app.task.Task.retry

KWierso/treeherder,kapy2010/treeherder,tojonmz/treeherder,KWierso/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,edmorley/treeherder,kapy2010/treeherder,akhileshpillai/treeherder,edmorley/treeherder,tojonmz/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,glenn124f/treeherder,tojon/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,edmorley/treeherder,kapy2010/treeherder,tojonmz/treeherder,tojon/treeherder,kapy2010/treeherder,akhileshpillai/treeherder,KWierso/treeherder,glenn124f/treeherder,glenn124f/treeherder,KWierso/treeherder,kapy2010/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,tojonmz/treeherder,edmorley/treeherder,tojon/treeherder,tojon/treeherder