hdf5

Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop)

* commit '1e8ef703cdc057211b3587be776a6e9f62e8f76f':
  Fixed a C++ style commenting issue and removed an unused field from H5F_trav_obj_ids_t.
  Fixed a memory issue in H5Drefresh() where the dataset's H5VL_object_t gets closed but we try to use it to find the driver.