Add lazy to umount

--- a/etc/init.d/netmount	2013-02-05 10:46:48.726214622 +0100
+++ b/etc/init.d/netmount	2013-02-04 15:10:09.601535144 +0100
@@ -56,7 +56,7 @@
 		esac
 	done
 	if [ -n "$fs" ]; then
-		umount -at $fs || eerror "Failed to simply unmount filesystems"
+		umount -at $fs || umount -atl $fs || eerror "Failed to simply unmount filesystems"
 	fi
 
 	eindent