Access logger improvements

[asvetlov]

Fix for #2123

[codecov-io]

Codecov Report

Merging #2145 into master will increase coverage by 0.01%.
The diff coverage is 97.43%.

@@            Coverage Diff             @@
##           master    #2145      +/-   ##
==========================================
+ Coverage   97.07%   97.09%   +0.01%     
==========================================
  Files          38       38              
  Lines        7728     7735       +7     
  Branches     1347     1351       +4     
==========================================
+ Hits         7502     7510       +8     
+ Misses        102      101       -1     
  Partials      124      124

Impacted Files	Coverage Δ
aiohttp/web_request.py	98.99% <100%> (+0.04%)	⬆️
aiohttp/helpers.py	97.29% <100%> (+0.18%)	⬆️
aiohttp/hdrs.py	100% <100%> (ø)	⬆️
aiohttp/web_protocol.py	87.8% <75%> (ø)	⬆️

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