Merging in latest from upstream (HDF5VOL/daos-vol:refs/heads/master)
* commit '09f56d1d029530ed060f23c22ec7e833ed443592':
Added implementation of H5Dget_storage_size()
Adding the link to the math library to h5daos_test_metadata_parallel alone.
Renamed h5daos_test_metadata.c to h5daos_test_metadata_parallel.c and added the link to the math library in CMake.
Added benchmarking for object opening functions and link functions.
Reclaim copy buffer for data copy when there is a vlen or reference type.
Implement asynchony for dataset data copy. Fix bug in automatic chunk sizing for scalar datasets with type size > target_chunk_size * sqrt(2)
Added benchmark for object closing (group, dataset, attribute, datatype, map, and file).
Added a program to benchmark metadata performance.
