antool: fix moving vltrace binary log for regeneration

[ldorau]

The essence of the fix is adding the condition:

if [ ! "$VLTRACE_SKIP" ]; then

to the test scripts, so that the binary log is not copied now, because it is unnecessary and wrong when the log is not regenerated. Copying the log when running parallel tests causes test failures.

Ref: #290

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This change is 

[krzycz]

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

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Comments from Reviewable

[marcinslusarz]

I tested it and it really fixes #290.

[codecov-io]

Codecov Report

Merging #311 into master will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
+ Coverage   79.32%   79.33%   +0.01%     
==========================================
  Files          81       81              
  Lines       12058    12061       +3     
  Branches     1628     1627       -1     
==========================================
+ Hits         9565     9569       +4     
  Misses       1886     1886              
+ Partials      607      606       -1

Impacted Files	Coverage Δ
src/libpmemfile-posix/read.c	92.24% <0%> (-1.68%)	:arrow_down:
src/libpmemfile-posix/file.c	65.93% <0%> (-0.28%)	:arrow_down:
src/libpmemfile/preload.c	44.57% <0%> (+0.06%)	:arrow_up:
src/libpmemfile-posix/rename.c	91.93% <0%> (+0.47%)	:arrow_up:
tests/posix/mt/mt.cpp	86.38% <0%> (+1.49%)	:arrow_up:

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[sarahjelinek]

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

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Comments from Reviewable