bug 872992 - clean up leo and hamachi hardcodes
Follow up to bug 872992 - Undo changes to gtest
Add support helix device.
There is no necessary to fix the revision of hardware/ril.
To modify some repositories in helix.xml from master to v1-train.
Merge branch 'v1-train' of https://github.com/mozilla-b2g/b2g-manifest into v1-train-gs2