Don't reuse a connection with the same URL but different proxy/TLS settings

[asvetlov]

Fixes #2981

[codecov-io]

Codecov Report

Merging #2985 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2985      +/-   ##
==========================================
+ Coverage   98.08%   98.08%   +<.01%     
==========================================
  Files          41       41              
  Lines        7621     7632      +11     
  Branches     1324     1327       +3     
==========================================
+ Hits         7475     7486      +11     
  Misses         49       49              
  Partials       97       97

Impacted Files	Coverage Δ
aiohttp/client_reqrep.py	97.42% <100%> (+0.04%)	⬆️
aiohttp/connector.py	98.17% <100%> (ø)	⬆️
aiohttp/client_exceptions.py	95.65% <100%> (ø)	⬆️

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[asvetlov]

Ready for review

[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