Avoid sending cookie attributes in Cookie header

[neumond]

Current implementation sends attributes of every cookie key-value pair in Cookie HTTP header:

key=value;
httponly;
Path=/;
secure;
key=value;
httponly;
Path=/;
secure;
key=value;
httponly;
Path=/;
expires=Sun, 31-Jan-2016 11:00:00 GMT;
Domain=.example.net.;

This behaviour is wrong, you can inspect specs to see that attributes must exist only in incoming Set-Cookie header and affect only cookie storage logic in decisions whether to send particular pair or not.

https://tools.ietf.org/html/rfc6265#section-3.1

[neumond]

https://travis-ci.org/KeepSafe/aiohttp/jobs/88759770

Strange. Is that good idea to take cookie name from Morsel?

[asvetlov]

Well, I support the idea for sending key-value pairs only.
The PR should respect both given Cookie header and cookies parameter (which is SimpleCookie),
Tests are required also.

[neumond]

I think it's done now. Please check.

[asvetlov]

Cool! Thanks!

[lock]

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