Add .gitreview file and fix documentation build

Change-Id: Ic95b7a2c04e0578f89d76bd77ca34301776658c8
Have a different worker name for each thread.

This makes each thread create their own git repo so threads don't
compete and cause race conditions

Change-Id: Ifaf1faf153d9b26a0ff302b00603573b04205b04