hdf5_ep

[svn-r17053] merge 17052 from trunk

Add a run to the h5repack shell script to read a family file
The file used for input is located in the common source tools for testfiles, in tools/testfiles
Modified the h5repack shell script to read files from this location (h5repack reads its input files from a dedicated testfiles location in h5repack/testfiles)
Changed the h5diff open file call to use h5tools_fopen, so that it can open all file drivers


Tested: linux