Run autorelabel in parallel by default

https://fedoraproject.org/wiki/Changes/SELinux_Parallel_Autorelabel

selinux-autorelabel

@@ -51,9 +51,15 @@ relabel_selinux() {
 	echo $"*** Relabeling could take a very long time, depending on file"
 	echo $"*** system size and speed of hard drives."
 
-	FORCE=`cat /.autorelabel`
-        [ -x "/usr/sbin/quotaoff" ] && /usr/sbin/quotaoff -aug
-	/sbin/fixfiles $FORCE restore
+	OPTS=`cat /.autorelabel`
+	# by default, use as many threads as there are available
+	# another -T X in $OPTS will override the default value
+	OPTS="-T 0 $OPTS"
+
+	[ -x "/usr/sbin/quotaoff" ] && /usr/sbin/quotaoff -aug
+	echo
+	echo $"Running: /sbin/fixfiles $OPTS restore"
+	/sbin/fixfiles $OPTS restore
     fi
 
     rm -f  /.autorelabel