hdf5_ep

Merge pull request #529 in HDFFV/hdf5 from ~BYRN/hdf5_adb:hdf5_1_8 to hdf5_1_8

* commit '7de9d76d81a951c921bda18fd85cbe25f343fe4a':
  remove old reference file
  Revert "Remove old file"
  Remove old file
  Add h5diff note
  HDFFV-9055 Correct file generation