Skip flake8 check on Python on 2.7
Skip flake8 check on Python on 2.7

flake8 is broken with Python 2.7, but
we have all other builds linting, so
not an issue for us.

gfyoung/hosts,StevenBlack/hosts,StevenBlack/hosts,borisschapira/hosts,gfyoung/hosts