Fix --no-error in test script

b8e91a32cd was applied incorrectly.
It changed the name of the variable set when specifying --no-error,
without changing the places checking it.

Set it back as it was to make --no-error work correctly again.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>

test

@@ -284,7 +284,7 @@ parse_args() {
       fi
       ;;
     --no-error)
-      exit_on_error=0
+      exitonerror=0
       ;;
     --disable-multipath)
       unset MULTIPATH