vchoi_fork

[svn-r12386] Purpose:
Added Exress Test mode.

Description:
The test takes a long time to run.  It tempted developers to skip the
h5committest.


Solution:
Added Express Test mode to allow tester an option to run it in express
mode (shorter time.)  There are already encoded QAK macro which skips
many tests.  Follow that pattern to skip tests when HDF5TestExpress is
set.

Platforms tested:
Tested in heping, both serial and parallel.