Minor fix to the LOOPBACKMOUNT variable, which is used in rc.mounts.

tmcd/linux/liblocsetup.pm

 #!/usr/bin/perl -wT
 #
 # EMULAB-COPYRIGHT
-# Copyright (c) 2000-2008 University of Utah and the Flux Group.
+# Copyright (c) 2000-2009 University of Utah and the Flux Group.
 # All rights reserved.
 #
 
@@ -56,7 +56,7 @@ $CP		= "/bin/cp";
 $DF		= "/bin/df";
 $EGREP		= "/bin/egrep -q";
 $NFSMOUNT	= "/bin/mount -o vers=2,udp"; # Force NFS Version 2 over UDP
-$LOOPBACKMOUNT	= "/bin/mount --bind ";
+$LOOPBACKMOUNT	= "/bin/mount -n -o bind ";
 $UMOUNT		= "/bin/umount";
 $TMPASSWD	= "$ETCDIR/passwd";
 $SFSSD		= "/usr/local/sbin/sfssd";