cgroups: turn on groups by default

The control groups we create are the ones recommended by the linux
kernel, so this should be on most of the time if cgroups are enabled in
the kernel.

init.d/sysfs.in

@@ -74,7 +74,7 @@ mount_misc()
 
 mount_cgroups()
 {
-	yesno ${rc_cgroups:-NO} || return 0
+	yesno ${rc_cgroups:-YES} || return 0
 	if [ ! -e /proc/cgroups ]; then
 		return 0
 	fi