[3.7] Use .raw_host instead of slower .host in client API (#4402)

[asvetlov]

(cherry picked from commit 95e548c)

Co-authored-by: Andrew Svetlov [email protected]

[codecov-io]

Codecov Report

Merging #4409 into 3.7 will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              3.7    #4409      +/-   ##
==========================================
- Coverage   97.89%   97.87%   -0.02%     
==========================================
  Files          44       44              
  Lines        8911     8911              
  Branches     1395     1395              
==========================================
- Hits         8723     8722       -1     
- Misses         78       79       +1     
  Partials      110      110

Impacted Files	Coverage Δ
aiohttp/client_reqrep.py	97.46% <100%> (ø)	⬆️
aiohttp/web_fileresponse.py	97.72% <0%> (-0.57%)	⬇️

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