skip integrity tests if sanitizer used

[lukaszstolarczuk]

Fixes: #231

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This change is 

[codecov-commenter]

Codecov Report

Merging #280 (26e4b65) into master (5fd1241) will increase coverage by 0.12%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
+ Coverage   87.26%   87.38%   +0.12%     
==========================================
  Files           9        9              
  Lines         785      785              
  Branches      144      144              
==========================================
+ Hits          685      686       +1     
  Misses         63       63              
+ Partials       37       36       -1     

Flag	Coverage Δ
tests_gcc_debug_cpp17	87.38% <ø> (+0.12%)	:arrow_up:

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Impacted Files	Coverage Δ
pmemstream/src/iterator.c	92.72% <0.00%> (+0.90%)	:arrow_up:

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