Close idle keep-alive connections on shutdown

[tahajahangir]

Fixing #1221

[codecov-io]

Current coverage is 98.28% (diff: 100%)

Merging #1222 into master will increase coverage by <.01%

@@             master      #1222   diff @@
==========================================
  Files            29         29          
  Lines          6483       6485     +2   
  Methods           0          0          
  Messages          0          0          
  Branches       1086       1087     +1   
==========================================
+ Hits           6372       6374     +2   
  Misses           59         59          
  Partials         52         52          

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[asvetlov]

Thanks!

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