Ref: https://github.com/pmem/libpmemobj-cpp/issues/356

Fixes: https://github.com/pmem/libpmemobj-cpp/issues/366

Implementation is based on concurrent_hash_map from Intel TBB library.

Test for persistent_concurrent_hash_map is built and executed only if
Intel TBB library found by CMake.

Update README for Intel TBB related tests.

Extend Docker images to support Intel TBB

Add abstraction for RW mutex

Add pmreorder test for concurrent_hash_map

and all utils for supporting custom libcxx.