hdf5_ep

[svn-r21875] Purpose:
  HDFFV-7602 - GMQS: HDF5 command tools: Provide framework for reusable test files among tools
  Stage2 working for h5copy tool.

Description:
  Update cmake script to fetch test files from anywhere.
  Also keep the apperance similiar to shell script for better maintainance.
  some updated shell script.
  Merged from HDF5 trunk r21874

Tested:
 jam (linux32-LE), koala (linux64-LE), heiwa (linuxppc64-BE), tejeda (mac32-LE), linew (solaris-BE),  Windows (32-LE cmake), Cmake (jam)