common: no need to parse config file in new

I saw "new" failed the TEST_DEV/SCRATCH_DEV validation when TEST_DEV or
SCRATCH_DEV points to directory, which is needed in overlayfs testing.

"new" only generates test template and doesn't need common/config to
parse and validate TEST_DEV/SCRATCH_DEV etc., so just returns after
setting all needed commands.

Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

common/config

@@ -270,6 +270,11 @@ fi
 rm -f /tmp/crc_check.img
 export XFS_MKFS_HAS_NO_META_SUPPORT
 
+# new doesn't need config file parsed, we can stop here
+if [ "$iam" == "new" ]; then
+	return 0
+fi
+
 _mount_opts()
 {
 	case $FSTYP in