tests: test *at interfaces with absolute paths

[GBuella]

This change is 

[codecov[bot]]

Codecov Report

Merging #395 into master will decrease coverage by 0.06%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #395      +/-   ##
==========================================
- Coverage   77.04%   76.98%   -0.07%     
==========================================
  Files          67       67              
  Lines        8330     8330              
  Branches     1678     1678              
==========================================
- Hits         6418     6413       -5     
- Misses       1495     1498       +3     
- Partials      417      419       +2

Flag	Coverage Δ
#ltp_tests	46.43% <ø> (ø)	:arrow_up:
#sqlite_tests	45.16% <ø> (-0.03%)	:arrow_down:
#tests_antool	15.24% <ø> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.03% <ø> (-0.04%)	:arrow_down:
#tests_posix_single_threaded	54.18% <ø> (-0.03%)	:arrow_down:
#tests_preload	44.73% <ø> (-0.03%)	:arrow_down:

Impacted Files	Coverage Δ
src/libpmemfile-posix/fcntl.c	66.03% <0%> (-3.78%)	:arrow_down:
src/libpmemfile-posix/dir.c	85.01% <0%> (-0.74%)	:arrow_down:
src/libpmemfile-posix/inode.c	88.31% <0%> (-0.35%)	:arrow_down:
src/libpmemfile-posix/data.c	94.82% <0%> (+0.39%)	:arrow_up:

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[krzycz]

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Reviewed 6 of 6 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[sarahjelinek]

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Reviewed 6 of 6 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