tests: Move some implemenations .hpp -> .cpp

[GBuella]

This change is 

[codecov[bot]]

Codecov Report

Merging #413 into master will decrease coverage by 0.18%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
- Coverage   77.15%   76.96%   -0.19%     
==========================================
  Files          67       67              
  Lines        8536     8536              
  Branches     1708     1708              
==========================================
- Hits         6586     6570      -16     
- Misses       1519     1537      +18     
+ Partials      431      429       -2

Flag	Coverage Δ
#ltp_tests	46.66% <ø> (-0.27%)	:arrow_down:
#sqlite_tests	46.2% <ø> (-0.03%)	:arrow_down:
#tests_antool	14.89% <ø> (ø)	:arrow_up:
#tests_posix_multi_threaded	26.04% <ø> (-0.1%)	:arrow_down:
#tests_posix_single_threaded	54.68% <ø> (+0.02%)	:arrow_up:
#tests_preload	45.46% <ø> (+0.09%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/fcntl.c	46.91% <0%> (-16.05%)	:arrow_down:
src/libpmemfile-posix/dir.c	85.04% <0%> (-0.5%)	:arrow_down:
src/libpmemfile-posix/write.c	86.38% <0%> (-0.47%)	:arrow_down:

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[krzycz]

Reviewed 2 of 2 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable

[sarahjelinek]

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable