aiohttp.client does not support HTTP redirect 308 (RFC 7538)

[himikof]

Currently, aiohttp.client does not support recent HTTP redirect code 308 Permanent Redirect, defined in RFC 7538. It is simply a permanent version of already handled 307 redirect, or a legacy-free version of 301 redirect.

I would also argue that normalize_path_middleware default redirect class should be changed to HTTPPermanentRedirect, as it is currently very surprising that a user agent will likely retry a POST request as a GET one after receiving a 301 redirect from path normalization, but that is probably a breaking API change.
Still, supporting 308 in aiohttp.client would allow normalize_path_middleware to be used with POST requests in asyncio <-> asyncio communication by specifying redirect 308 manually.

[fafhrd91]

Would you provide PR for client?

[asvetlov]

Fixed by #2134

[lock]

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