Refactored util pipe handling (#244)

[bkryza]

Fixes #244

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.57143% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 86.90%. Comparing base (a404a30) to head (674441f).

Files	Patch %	Lines
src/util/util.cc	78.57%	9 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
- Coverage   86.90%   86.90%   -0.01%     
==========================================
  Files         122      122              
  Lines       13097    13110      +13     
==========================================
+ Hits        11382    11393      +11     
- Misses       1715     1717       +2     

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