hdf5_ep

Merge pull request #253 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop

* commit 'e4b314c47c1c50b326c5f72254a662c284a26b97':
  Fix indentation
  Fix script varnames
  Chnage test dir to avoid parallel test collisions
  Add autotools version of plugin tests for UD filters
  HDFFV-9994 add h5ls reference file to copy
  HDFFV-9994 - correct reference file
  HDFFV-9994 add UD tests for tools
  Add goto error for dataset read failure. Fixed comments