Avoid passing layout nullptr to string constructor (undefined behavior)

Typo fix proxy address in Docker README

tests: introduce run_test function

it wraps called function with try/catch block and calls backtrace init methods.

Print warning only in verbose mode

Remove unnecessary chown step from GHA yaml script

Skip benchmarks when not needed

Create separate Docker images for v1.10 branch

Fix a typo in one comment

Replace 'functionallities' with 'functionalities'.

Merge stable-1.8 into master

Update docs in defragmentation class

Update PMDK dependency to 1.8

Merge stable-1.7 into stable-1.8

Merge stable-1.6 into stable-1.7

Create separate Docker images for stable-1.8 branch

Create separate Docker images for stable-1.7 branch

Create separate Docker images for stable-1.6 branch

update README files

Fix basic_string.access tests

Update READme.md and include/libpmemobj++/README.md with an
information about containers. Fix compiler requirements.

fix: adjust UT_ASSERT to gcc 7.5.0 from openSUSE Leap

Create separate Docker images for v1.9 branch