Revert "Ensure update_manifests celery task is retried (Bug 928462)"
Revert "Ensure update_manifests celery task is retried (Bug 928462)"

This reverts commit aef3625eed4edffcdf3ff29b4e338cb3ba7b7597.

washort/zamboni,mozilla/zamboni,washort/zamboni,elysium001/zamboni,jasonthomas/zamboni,elysium001/zamboni,elysium001/zamboni,clouserw/zamboni,eviljeff/zamboni,shahbaz17/zamboni,mstriemer/zamboni,diox/zamboni,mudithkr/zamboni,Jobava/zamboni,luckylavish/zamboni,ayushagrawal288/zamboni,tsl143/zamboni,kumar303/zamboni,luckylavish/zamboni,ingenioustechie/zamboni,kumar303/zamboni,eviljeff/zamboni,shahbaz17/zamboni,mozilla/zamboni,shahbaz17/zamboni,clouserw/zamboni,luckylavish/zamboni,eviljeff/zamboni,washort/zamboni,ayushagrawal288/zamboni,mudithkr/zamboni,mstriemer/zamboni,mozilla/zamboni,clouserw/zamboni,Jobava/zamboni,andymckay/zamboni,andymckay/zamboni,jamesthechamp/zamboni,elysium001/zamboni,ddurst/zamboni,Hitechverma/zamboni,ddurst/zamboni,diox/zamboni,ddurst/zamboni,mudithkr/zamboni,ngokevin/zamboni,Jobava/zamboni,Hitechverma/zamboni,jasonthomas/zamboni,kumar303/zamboni,shahbaz17/zamboni,tsl143/zamboni,andymckay/zamboni,ingenioustechie/zamboni,tsl143/zamboni,ngokevin/zamboni,Jobava/zamboni,ngokevin/zamboni,mudithkr/zamboni,ddurst/zamboni,jamesthechamp/zamboni,jamesthechamp/zamboni,diox/zamboni,eviljeff/zamboni,mozilla/zamboni,washort/zamboni,ingenioustechie/zamboni,mstriemer/zamboni,jamesthechamp/zamboni,jasonthomas/zamboni,Hitechverma/zamboni,jasonthomas/zamboni,luckylavish/zamboni,kumar303/zamboni,ayushagrawal288/zamboni,clouserw/zamboni,diox/zamboni,ingenioustechie/zamboni,mstriemer/zamboni,ayushagrawal288/zamboni,Hitechverma/zamboni,tsl143/zamboni