hdf5_msb

[svn-r23492] Bug fix:
Test was not checking error result. It basically return succeess to make check
all the time.

Fixed it so that it does check the return code of the test (plugin) and set
nerror accordingly.  It then exit 1 if there is any error detected.

Test: use the desy committest to pass on jam, koala, ostrich, duck and emu.
Also hand test by "rm test/.lib/libdynlib1* to verify the test script can
indeed response to errors properly.