Support .netrc by trust_env

[asvetlov]

.netrc has information about logins and password.
Applying it to client request when trust_env=True would be awesome.

Volunteers are welcome!

[asvetlov]

Fixed by #2584

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new