hdf5_ep

[svn-r22057] Purpose:
  Fix for HDFFV-7835 h5diff: incorrect result for comparing the two same type symlinks as dangling links.

Description:
  When two symbolic dangling links are compared with --follow-symlinks option,
  the result should be same. It works for comparing two files, but didn't work
  for comparing two objects. 
  Test cases were added and tagged with jira#.
  Merged from HDF5 trunk r22038.

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