Merge stable-1.8 into master

[igchor]

This change is 

[pmem-bot]

@karczex and @szyrom please review this pull request

[ldorau]

Reviewable status: complete! all files reviewed, all discussions resolved

[szyrom]

Reviewable status: complete! all files reviewed, all discussions resolved

[codecov]

Codecov Report

Merging #651 into master will increase coverage by 1.2%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #651     +/-   ##
=========================================
+ Coverage   95.86%   97.06%   +1.2%     
=========================================
  Files          40       34      -6     
  Lines        4131     4055     -76     
=========================================
- Hits         3960     3936     -24     
+ Misses        171      119     -52

Flag	Coverage Δ
#tests_clang_debug_cpp17	97.04% <ø> (+1.14%)	⬆️
#tests_gcc_debug	94.01% <ø> (+0.96%)	⬆️

Impacted Files	Coverage Δ
include/libpmemobj++/mutex.hpp	80% <0%> (-6.96%)	⬇️
include/libpmemobj++/make_persistent.hpp	85.18% <0%> (-6.49%)	⬇️
include/libpmemobj++/timed_mutex.hpp	81.81% <0%> (-5.28%)	⬇️
include/libpmemobj++/shared_mutex.hpp	85.41% <0%> (-4.06%)	⬇️
include/libpmemobj++/allocator.hpp	93.33% <0%> (-2.5%)	⬇️
include/libpmemobj++/container/basic_string.hpp	99.62% <0%> (-0.11%)	⬇️
include/libpmemobj++/detail/life.hpp	98.3% <0%> (-0.03%)	⬇️
...nclude/libpmemobj++/detail/persistent_pool_ptr.hpp	100% <0%> (ø)	⬆️
include/libpmemobj++/detail/ctl.hpp	100% <0%> (ø)	⬆️
...libpmemobj++/detail/enumerable_thread_specific.hpp
... and 19 more

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