check-code: drop the `safehasattr` rule Since we no longer supports Python 2 we no longer needs to use a custom function to compensate the short comings of the global `hasattr` function in it. We cannot use the Python 3 `hasattr` function instead.

url: ignore some future pytype error As soon as we start using the builtins `hasattr` function, pytype will start getting confused about which types are available or not. So we ignore this error beforehand.

url: move the _generic_proxytunnel in the `has_https` block It is only used when https exists. If you stay out of the block, pytype complains that the type of its argument are not declared.