pylint is not used since bb5b1a0. The pyflakes cleanup mentioned in that
commit has not been done, but given that this project is no longer being
actively developed I don't think it's worth spending time doing it.
Leaving the pylint suppressions causes confusion because it leads people
to think that we are still using pylint.
Change-Id: If7d9f280a0f408c780f15915ffdb80579ae21f69