Document why certain Sqlite tests fail.

[marcinslusarz]

This change is 

[krzycz]

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Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[codecov[bot]]

Codecov Report

Merging #403 into master will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
+ Coverage   77.02%   77.07%   +0.04%     
==========================================
  Files          67       67              
  Lines        8330     8330              
  Branches     1678     1678              
==========================================
+ Hits         6416     6420       +4     
+ Misses       1496     1494       -2     
+ Partials      418      416       -2

Flag	Coverage Δ
#ltp_tests	46.45% <ø> (ø)	:arrow_up:
#sqlite_tests	45.14% <ø> (ø)	:arrow_up:
#tests_antool	15.24% <ø> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.07% <ø> (+0.01%)	:arrow_up:
#tests_posix_single_threaded	54.18% <ø> (-0.03%)	:arrow_down:
#tests_preload	44.82% <ø> (+0.14%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/dir.c	85.99% <0%> (+0.98%)	:arrow_up:

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