Bug 941833 - mach mercurial-setup should define host fingerprints during repo operations; r=nalexander

DONTBUILD (NPOTB)

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extra : rebase_source : 64bfe02d9f27009ab896b09c54fe7e48953a280d
Bug 834243 - Revert to old behavior of holding off from starting the compositor until we have successfully preallocated its EGLSurface - r=snorp