resolve read_timeout

[thehesiod]

• fixes [Tracking] Config read_timeout not behaving correctly #245
• cleanup by moving more code to use wrapt
• implement set_socket_timeout

[thehesiod]

hey Jettify, let me know what you think. All this because aiohttp dev didn't want to fix a core issue in their impl :(

[codecov-io]

Codecov Report

Merging #248 into master will increase coverage by 1.08%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
+ Coverage   86.28%   87.36%   +1.08%     
==========================================
  Files           8        8              
  Lines         452      467      +15     
==========================================
+ Hits          390      408      +18     
+ Misses         62       59       -3

Impacted Files	Coverage Δ
aiobotocore/endpoint.py	90.44% <97.05%> (+3.12%)	⬆️

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[jettify]

I think aiohttp will do right thing eventually, we just need to make sure we can remove it easily and be very careful for each aiohttp release.

By the way next aiohttp will have new multi dict that preserves original headers

[thehesiod]

We shall see since I can't drive that anymore given his response. Should I merge this PR or would you like me change something? Thanks!

[jettify]

change looks good, it uses a bit internal API but I do not see better way. We can merge, but lets do not close #245 at some point we need revert this PR once aiohttp ready

[thehesiod]

@jettify take a look at the last commit :) Will make our lives easier