* add run.using = 'run-task' for native-engine
* modify run-task to run on OS X
- not as root
- without assuming /home/worker (using ~ and os.expanduser instead)
- hg is in /usr/local/bin on OS X; trust the PATH
* add_build_dependency isn't docker-worker specific, so just rename
* support_vcs_checkout modified to omit caches on native-engine
* don't download fingerprints on OS X; these hosts are configured with
the proper fingerprint via puppet
MozReview-Commit-ID: C83XClXtcn4
The other changesets for this bug worked on Try but failed on
autoland due to permissions failures in /home/worker/workspace.
Ensure the files have the proper permissions.
The path is a cache with the repo and build type keyed into it.
So there should be no problem with this change causing permissions
issues for other tasks.
