Upgrade aiohttp to 3.3.0

[fabaff]

Description:

Changelog: https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#330-2018-06-01

Example entry for configuration.yaml (if applicable):

http:

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

[pvizeli]

They changed the timeout handling. Now it is a class and for clients requests, the async_timeouts are strongly discounted while he destroy the internal cleanups.

@balloob, we should cleaning our handling with this PR too...

[fabaff]

As a reference their discussion: aio-libs/aiohttp#2768

[balloob]

So we should refractor all async_timeout and use their class instead? I guess easiest will be to just put a default total timeout in our request session and then remove the calls to async timeout?

What will be raised when a timeout occurs, still the exception from asyncio module?

[pvizeli]

@balloob yes. And yes we should use a default timeout object to helpers/aiohttp_client. I think we should also rename aiohttp_client to webclient. (hass.helpers.webclient is better to read)

[balloob]

So I think that we should write up these issues, but still go ahead and merge this.