hdf5_ep

[svn-r17516] In the function test_rw_noupdate, I added a test with the system functions to make
sure the stat function behaves as we expected.  This test is skipped on some system because 
the modification time from stat is the same as the last access time (We know OpenVMS behaves 
in this way).

Tested on jam, smirom, and linew.  My account for OpenVMS expired.  I'll test it once I have
it back.