ipfix output - add option to use non-blocking tcp socket

[SiskaPavel]

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Codecov Report

Attention: Patch coverage is 1.53846% with 64 lines in your changes missing coverage. Please review.

Project coverage is 40.88%. Comparing base (bd14632) to head (7c749c8). Report is 3 commits behind head on master.

Files	Patch %	Lines
output/ipfix.cpp	1.58%	62 Missing :warning:
output/ipfix.hpp	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
- Coverage   41.12%   40.88%   -0.25%     
==========================================
  Files         104      104              
  Lines        9846     9899      +53     
  Branches     1438     1455      +17     
==========================================
- Hits         4049     4047       -2     
- Misses       4944     4999      +55     
  Partials      853      853              

Flag	Coverage Δ
tests	40.88% <1.53%> (-0.25%)	:arrow_down:

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