Bug 1070041 - Move more Mozharness job definition parameters into the tree. r=ahal

* We are unifying the in-tree mozharness configs to follow the same
structure
* We are moving run_filename into the tree
* We are also staring the move to manage the testdir value which
is already in use for Android test jobs

--HG--
extra : rebase_source : 6d667cd50e54fe16edc5ddff5f29039c5ae82523