posix: add some logging for permission checks

[marcinslusarz]

This change is 

[codecov[bot]]

Codecov Report

Merging #439 into master will decrease coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #439      +/-   ##
==========================================
- Coverage    78.9%   78.87%   -0.04%     
==========================================
  Files          71       71              
  Lines        8809     8815       +6     
  Branches     1774     1775       +1     
==========================================
+ Hits         6951     6953       +2     
- Misses       1409     1412       +3     
- Partials      449      450       +1

Flag	Coverage Δ
#ltp_tests	45.67% <71.42%> (+0.16%)	:arrow_up:
#sqlite_tests	45.63% <71.42%> (-0.04%)	:arrow_down:
#tests_antool	15.05% <0%> (-0.02%)	:arrow_down:
#tests_posix_multi_threaded	25.34% <28.57%> (+0.03%)	:arrow_up:
#tests_posix_single_threaded	57.03% <100%> (+0.03%)	:arrow_up:
#tests_preload	44.7% <71.42%> (+0.03%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/file.c	83.24% <100%> (+0.08%)	:arrow_up:
src/libpmemfile-posix/dir.c	90.7% <100%> (+0.51%)	:arrow_up:
src/libpmemfile-posix/creds.c	87.65% <100%> (+0.15%)	:arrow_up:
src/libpmemfile-posix/offset_mapping.c	85% <0%> (-1.43%)	:arrow_down:
src/libpmemfile-posix/rename.c	91.09% <0%> (-0.81%)	:arrow_down:
src/libpmemfile-posix/data.c	94.09% <0%> (-0.79%)	:arrow_down:
src/libpmemfile-posix/inode.c	88.41% <0%> (-0.34%)	:arrow_down:
src/libpmemfile-posix/write.c	87.55% <0%> (+0.47%)	:arrow_up:

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[krzycz]

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Reviewed 3 of 3 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks broke.

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[GBuella]

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Reviewed 3 of 3 files at r1. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable