util: add a comment to suppress a PyCharm warning about a PEP 8 violation Slowly trying to get rid of silly warnings, so that real problems aren't hidden.

keepalive: fix a signature mismatch for a http.client.HTTPResponse subclass Also flagged by PyCharm. This is checked by pytype too, so I'm not sure why it misses this. I verified in py36 that this argument is documented for the function, so maybe this is py2 legacy.