Align ip extraction and add proxy headers tests

[inbaltako]

No description provided.

[codecov-io]

Codecov Report

Merging #44 (86cf57b) into master (b9fc52b) will increase coverage by 5.08%.
The diff coverage is 77.64%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   82.56%   87.64%   +5.08%     
==========================================
  Files          49       49              
  Lines        1038     1004      -34     
==========================================
+ Hits          857      880      +23     
+ Misses        181      124      -57     

Impacted Files	Coverage Δ
securenative/utils/request_utils.py	63.49% <48.38%> (-6.78%)	⬇️
securenative/config/configuration_manager.py	81.57% <80.00%> (-0.78%)	⬇️
securenative/utils/ip_utils.py	95.65% <87.50%> (+4.34%)	⬆️
tests/configuration_manager_test.py	94.91% <96.00%> (+33.57%)	⬆️
securenative/utils/version_utils.py	100.00% <100.00%> (ø)
tests/api_manager_test.py	98.03% <100.00%> (ø)
tests/request_utils_test.py	100.00% <100.00%> (ø)

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