Refactor http/1 keep-alive timer

[fafhrd91]

No description provided.

[codecov]

Codecov Report

Attention: 72 lines in your changes are missing coverage. Please review.

Comparison is base (f07c057) 89.90% compared to head (ae3223b) 89.70%.

Files	Patch %	Lines
ntex/src/http/config.rs	65.65%	34 Missing ⚠️
ntex/src/http/h1/dispatcher.rs	65.78%	26 Missing ⚠️
ntex/src/http/builder.rs	75.00%	8 Missing ⚠️
ntex/src/http/service.rs	50.00%	3 Missing ⚠️
ntex/src/web/test.rs	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
- Coverage   89.90%   89.70%   -0.21%     
==========================================
  Files         189      189              
  Lines       31992    32076      +84     
==========================================
+ Hits        28764    28773       +9     
- Misses       3228     3303      +75     

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