bump docker images versions

[lukaszstolarczuk]

• bump Fedora version (28 -> 32)
• Ubuntu is already set to LTS version (18.04)

Also, set clang-format to fixed version (6.0), bump Valgrind version, bump PMDK's patch version, and use ndctl from packages in CI (rather than installing from sources).

ref. to #737 - we decided to bump dockerimages on all branches.

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This change is 

[lukaszstolarczuk]

Updating version of older docker images, for older branches (stable-1.*) is not always an easy job, because of dependencies... we need to discuss our approach.

[codecov]

Codecov Report

Merging #814 into stable-1.5 will decrease coverage by 0.14%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           stable-1.5     #814      +/-   ##
==============================================
- Coverage       90.77%   90.63%   -0.15%     
==============================================
  Files              26       26              
  Lines            1052     1025      -27     
==============================================
- Hits              955      929      -26     
+ Misses             97       96       -1     

Flag	Coverage Δ
#tests_clang_debug_cpp17	61.93% <ø> (-29.53%)	⬇️
#tests_clang_release	61.46% <ø> (-28.86%)	⬇️
#tests_gcc_debug	93.61% <ø> (+0.20%)	⬆️
#tests_gcc_release_cpp17	89.39% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
include/libpmemobj++/detail/conversions.hpp	80.00% <0.00%> (-20.00%)	⬇️
include/libpmemobj++/make_persistent.hpp	76.19% <0.00%> (-14.29%)	⬇️
include/libpmemobj++/make_persistent_array.hpp	83.33% <0.00%> (-5.35%)	⬇️
include/libpmemobj++/condition_variable.hpp	82.66% <0.00%> (-2.67%)	⬇️
include/libpmemobj++/transaction.hpp	87.34% <0.00%> (-2.54%)	⬇️
include/libpmemobj++/detail/life.hpp	92.30% <0.00%> (-1.81%)	⬇️
...lude/libpmemobj++/make_persistent_array_atomic.hpp	94.73% <0.00%> (-0.51%)	⬇️
include/libpmemobj++/experimental/array.hpp	100.00% <0.00%> (ø)
.../libpmemobj++/experimental/contiguous_iterator.hpp	100.00% <0.00%> (ø)
include/libpmemobj++/persistent_ptr.hpp	97.19% <0.00%> (+1.74%)	⬆️
... and 3 more

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[igchor]

Reviewed 6 of 6 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved