Start test server on socket instead of host/port pair.

[playpauseandstop]

What do these changes do?

Fix random OSError on running tests for aiohttp app on large amount of tests.

Are there changes in behavior for the user?

Changes should just work for most of users. It's improvement of creating test server, by passing sock instead of host / port pair

Related issue number

#1895

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new entry to CHANGES.rst
  • Choose any open position to avoid merge conflicts with other PRs.
  • Add a link to the issue you are fixing (if any) using #issue_number format at the end of changelog message. Use Pull Request number if there are no issues for PR or PR covers the issue only partially.

[asvetlov]

The perfect catch, very thank you @playpauseandstop
Will merge it after CI passed

[asvetlov]

But please add an entry to CHANGES.txt like Make test server more reliable. #1896

[codecov-io]

Codecov Report

Merging #1896 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1896      +/-   ##
==========================================
+ Coverage   97.06%   97.06%   +<.01%     
==========================================
  Files          37       37              
  Lines        7558     7560       +2     
  Branches     1314     1314              
==========================================
+ Hits         7336     7338       +2     
  Misses        100      100              
  Partials      122      122

Impacted Files	Coverage Δ
aiohttp/test_utils.py	99.28% <100%> (ø)	⬆️

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[playpauseandstop]

@asvetlov

Updated CHANGES.txt & CONTRIBUTORS.txt

[fafhrd91]

thanks!

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