Enable E251,E265 rules ignore H402

After bumping the hacking version to the 0.9.x series ignores were
added for several rules. This commit fixes the violations for a subset
of these rules and re-enables the checks.

Change-Id: If2445c395d481f3c5f6426a471da4ec8afb553f0
Merge "Enable E251,E265 rules ignore H402"