We had the normal infra pep8 ignores marked, but follow some of them by hand
in this codebase anyway. While E12* are not valid pep8, the prevailing style
of shade is in agreement with them. While we weren't enforcing them, a few
instances snuck in. Fix them and just turn the flags on.
Change-Id: Iea2bd9a99eb8b20dd40418ac8479b809d3872de8
c9e9ef9f43