Do not filter cookies if unsafe flag provided

[bmwant]

What do these changes do?

For the testing purposes or when user is aware about what he is doing it's handy to be able provide unsafe cookie jar (so cookies will be preserved even for domain specified as IP address, e.g. 127.0.0.1)

Are there changes in behavior for the user?

cookie_jar = aiohttp.CookieJar(loop=loop, unsafe=True)
with aiohttp.ClientSession(loop=loop, cookie_jar=cookie_jar) as session:
    resp = await session.get('http://127.0.0.1/')
    print(resp.cookies)
    await resp.release()

Now cookies right in place

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[coveralls]

Coverage remained the same at 97.971% when pulling fd22462 on kpidata:master into 32c0f1d on KeepSafe:master.

[asvetlov]

Shame on me, I've missed the second IP address check.

[asvetlov]

Will be fixed in aiohttp 0.22.3

[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.