Move tags FIREFOX_34_0_BUILD2, FIREFOX_34_0_RELEASE back to 456394191c90, after accidental 2nd tagging run moved them, a=releng-bunnies-in-a-row

--HG--
branch : GECKO340_2014112606_RELBRANCH
extra : amend_source : b291177a0f638482706b07b6281532573e9d06c0