vchoi_fork

[svn-r19978] Patched in a temporary fix so that:
When $HDF5ExpressTest is NOT set or when it is set to 1 or 0, it does not
  skip test.
When $HDF5ExpressTest is set other than values above, it may skip tests.
  The following message is printed:
  Test skipped
  when some tests are really skipped.

This is a temporary patch so that v186 can be tested. A more permanent fix
is needed, later.

Tested: h5committest.