docker: add various test scripts features

[llugin]

Option to run single test. Equivalent test command printed in verbose mode. Inline hash comment in tests and fails list files omitted.

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This change is 

[codecov[bot]]

Codecov Report

Merging #389 into master will increase coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #389      +/-   ##
=========================================
+ Coverage   76.87%   76.9%   +0.03%     
=========================================
  Files          67      67              
  Lines        8276    8276              
  Branches     1665    1665              
=========================================
+ Hits         6362    6365       +3     
  Misses       1495    1495              
+ Partials      419     416       -3

Flag	Coverage Δ
#ltp_tests	46.43% <ø> (ø)	:arrow_up:
#sqlite_tests	45.16% <ø> (ø)	:arrow_up:
#tests_antool	14.71% <ø> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.07% <ø> (+0.02%)	:arrow_up:
#tests_posix_single_threaded	54.21% <ø> (ø)	:arrow_up:
#tests_preload	44.7% <ø> (+0.04%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/data.c	94.02% <0%> (-0.4%)	:arrow_down:
src/libpmemfile-posix/inode.c	88.65% <0%> (+0.34%)	:arrow_up:
src/libpmemfile-posix/dir.c	85.74% <0%> (+0.73%)	:arrow_up:

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[krzycz]

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

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