Adds reconnect support using celery error recovery feature.
Added check for AuthenticationFailure Exception by code attribute
Adjust raise style to not clobber the traceback being re-raised.
Merge pull request #8 from pulp/bmbouter-celery-reconnect-support

1096539 - Celery reconnect support
Merge branch 'pulp-dep-3.0.15-with-qpid' into qpid-transport