Bug 898554 - Add tooltool hashes for b2g analysis, and update the sixgill hash to a more generally useful one. a=bustage+hazbuild-only

--HG--
extra : amend_source : ce996477a61c4bc082508787b0f12b273371b449
extra : transplant_source : %BD%B1%AF%2C%18%FD%3E%9E%40%0E%0A%F4%01%B0%FA%F1%F6%EC%0B%E3
(sort of) bug 898554 - raise expected hazard count for b2g to 4 until they are fixed, a=bustage+hazbuild-only

--HG--
extra : rebase_source : eef770dbd323ca7be7e6e4b3f8db336560a45ebe