the contents of this dir (testing/mozharness) represent two parts
1) the old way: mozharness.json is a manifest file that locks or "pins" mozharness to a repository and a revision.
2) the new way: an in-gecko-tree copy of mozharness.
* hgmo/build/mozharness is still live and the defacto read/write repository
* continuous integration jobs are based on this copy
* As we transition to dropping support for hg.m.o/build/mozharness, this copy will continue to be synced
* this copy is currently based on: http://hg.mozilla.org/build/mozharness/rev/45206195f4ed (mozilla-b2g37_v2_2)