Update from requirements

The specifically desired change is the one to setup.py which removes the
reference to d2to1. d2to1 is very undesirable to consume due to its
explicit dependency on distribute that is still unfixed. While we're
doing it, go ahead and do the full update.py from requirements.txt to
reduce later churn.

Change-Id: Ia862337b904ba021db8fc21cb21b886f948bd3fc
Merge "Update from requirements"