re-store local cfg CMD changes correctly

lustre/tests/cfg/local.sh

@@ -60,8 +60,9 @@ MKFSOPT=""
     MDSOPT=$MDSOPT" --param lov.stripecount=$STRIPES_PER_OBJ"
 [ "x$L_GETIDENTITY" != "x" ] &&
     MDSOPT=$MDSOPT" --param mdt.identity_upcall=$L_GETIDENTITY"
+MDSn_MKFS_OPTS=$MDS_MKFS_OPTS
 MDS_MKFS_OPTS="--mgs --mdt --fsname=$FSNAME --device-size=$MDSSIZE --param sys.timeout=$TIMEOUT $MKFSOPT $MDSOPT $MDS_MKFS_OPTS"
-MDSn_MKFS_OPTS="--mgsnode=$MGSNID --mdt --fsname=$FSNAME --device-size=$MDSSIZE --param sys.timeout=$TIMEOUT $MKFSOPT $MDSOPT $MDS_MKFS_OPTS"
+MDSn_MKFS_OPTS="--mgsnode=$MGSNID --mdt --fsname=$FSNAME --device-size=$MDSSIZE --param sys.timeout=$TIMEOUT $MKFSOPT $MDSOPT $MDSn_MKFS_OPTS"
 
 MKFSOPT=""
 [ "x$OSTJOURNALSIZE" != "x" ] &&