(2/2)Cherry-pick before build

This will enable us to specify gerrit commits not yet merged
to be cherry-picked before build starts

Change-Id: I082d7fcdba87bca528bbab98cba73634a4793131
PS1: Port to pac-4.4 branch
- Resolve inconsistent JSON responses
- Fix derp
PS2: Fix CM JSON response; update LX cherry-picks
- Fix derp
PS3: Move cherries.sh to vendor/pac
- compensate for leading zero in fetch/ref