[svn-r18986] Test feature: (bugs 1919)

Problem:
some launching command like yod (and sometimes mpirun), do not pass
back the exit code of the executables back to the shell. It always returns 0
if it can launch the executable. This cause tests that expect non-zero exit
code to fail incorrectly.

Short term Solution:
Added the feature that if $RUNSERIAL_NOEXITCODE is defined, do not
test conditions that rely on non-zero exit code.

Tests:
dove-linux using RUNSERIAL=thgyod to see the failures and using
$RUNSERIAL_NOEXITCODE=yes to bypass the errors.
Also h5committested.

tools/h5diff/testh5diff.sh

@@ -67,6 +67,7 @@ DIFF='diff -c'
 
 nerrors=0
 verbose=yes
+h5haveexitcode=yes	    # default is yes
 pmode=			    # default to run h5diff tests
 mydomainname=`domainname 2>/dev/null`
 
@@ -103,6 +104,13 @@ while [ $# -gt 0 ]; do
     esac
 done
 
+# RUNSERIAL is used. Check if it can return exit code from executalbe correctly.
+if [ -n "$RUNSERIAL_NOEXITCODE" ]; then
+    echo "***Warning*** Serial Exit Code is not passed back to shell corretly."
+    echo "***Warning*** Exit code checking is skipped."
+    h5haveexitcode=no
+fi
+
 # Print a line-line message left justified in a field of 70 characters
 # beginning with the word "Testing".
 #
@@ -224,7 +232,7 @@ TOOLTEST() {
     # is from mpirun not tool)
     # if any problem occurs relate to an exit code, it will be caught in 
     # serial mode, so the test is fullfilled.
-    if test -z "$pmode"; then
+    if test $h5haveexitcode = 'yes' -a -z "$pmode"; then
       echo "EXIT CODE: $EXIT_CODE" >> $actual
     fi
 
@@ -234,7 +242,7 @@ TOOLTEST() {
         cp $actual $expect
     elif $CMP $expect $actual; then
         echo " PASSED"
-    elif test -z "$pmode"; then
+    elif test $h5haveexitcode = 'yes' -a -z "$pmode"; then
         echo "*FAILED*"
         echo "    Expected result ($expect) differs from actual result ($actual)"
         nerrors="`expr $nerrors + 1`"