Check address family to fill wsgi env properly

[redixin]

No description provided.

[merrellb]

I must admit I don't have a good grasp of the underlying networking code. It seems to address the immediate issue with unpacking the sockname tuple. However in terms of equivalency to the old code.

• This commit loses the split(':')[0] on the hostname as well as the fallback to _host from the sockname.
• This commit no longer checks self.transport.get_extra_info('peername') before trying to unpack the values. Does the family check insure that this will succeed?

[redixin]

@merrellb oh, I forgot it, thanks

[merrellb]

Cool. So we prefer to get SERVER_NAME and SERVER_PORT from the message rather than self.transport.get_extra_info('sockname')?

[asvetlov]

@merrellb yes, request's HOST header is the preferable source for host info.

@redixin looks good. Please fix flake8 errors.

[redixin]

@asvetlov done. Also added skipTest if no AF_UNIX (appveyor)

[asvetlov]

thanks

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