[python3] setup: Removed 2to3.
[python3] setup: Removed 2to3.

--HG--
extra : transplant_source : Q%26%03%8DA%1A%D5%EEI%13%E3%A4%BB6%D3%BFq%A3%E8%7B

userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework