hdf5_ep

Merge pull request #1386 in HDFFV/hdf5 from ~JHENDERSON/hdf5:develop to develop

* commit 'b4fe787bb9fe4bfc4709a124df59dd987c9a09d2':
  Add test for H5Arename NULL/empty attribute name fix
  align H5Arename behavior with H5Arename_by_name