avoid duplicate mounts while using mount.glusterfs

This change is needed as the format of how the /etc/mtab entry of glusterfs
mount looks is now changed.

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>

xlators/mount/fuse/utils/mount.glusterfs.in

@@ -150,7 +150,7 @@ main ()
     mount_point="$2";
 
     # Simple check to avoid multiple identical mounts
-    if grep -q "glusterfs $mount_point fuse" /etc/mtab; then
+    if grep -q " $mount_point fuse.glusterfs " /etc/mtab; then
         echo "$0: according to mtab, GlusterFS is already mounted on $mount_point"
         exit 1
     fi