hdf5_ep

[svn-r18106] bug 1673:
The mixed use of RUNTEST (original) and RUNTESTS (new) caused
confusion. E.g., the timings in test/ was still using the old
$RUNTEST.  It made more sense to use $RUNTEST which is used
by the dejagnu feature of automake.  So, I changed all
$RUNTEST or $RUNTESTS to $RUNEXEC.

config/commence.am & config/conclude.am are the two files
that got changes. Also fixed an error in test/Makefile.am.
The rest are changed by bin/reconfigure.

Tested: h5committested.