ORI-448 tests: Allocate sequences on MOUNT2 clients in replay_barrier()

In order to avoid sequence file updates after a target is made
read-only, replay_barrier() creates a file in "MOUNT" on every client
node.  This is not enough because the "MOUNT2" clients may also trigger
sequence file updates.  This patch makes sure the trick is applied to
"MOUNT2" clients as well.

Change-Id: I832689a2d2ca205d927bc5d0a15ab14fceb3bf80
Signed-off-by: Li Wei <liwei@whamcloud.com>
Reviewed-by: Mikhail Pershin <tappro@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1939

lustre/tests/test-framework.sh

@@ -1681,7 +1681,9 @@ replay_barrier() {
 
     # make sure there will be no seq change
     local clients=${CLIENTS:-$HOSTNAME}
-    do_nodes $clients "f=${MOUNT}/fsa-\\\$(hostname); mcreate \\\$f; rm \\\$f"
+    local f=fsa-\\\$\(hostname\)
+    do_nodes $clients "mcreate $MOUNT/$f; rm $MOUNT/$f"
+    do_nodes $clients "if [ -d $MOUNT2 ]; then mcreate $MOUNT2/$f; rm $MOUNT2/$f; fi"
 
     local svc=${facet}_svc
     do_facet $facet $LCTL --device %${!svc} notransno