hdf5_ep

[svn-r21901] Purpose:
  HDFFV-7602 - GMQS: HDF5 command tools: Provide framework for reusable test files among tools
  Stage2 working for h5repack cmake test.

Description:
  Update cmake script to clean up correctly.
  Revisit h5repack cmake test script updated from r21870.
  Also sync with HDF5 trunk. (Jira 2605)
  
Tested:
 cmake test for Windows (32-LE) and jam (linux32-LE)