Add one TODO item for Xfrin.

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@2927 e5f2f494-b856-4b98-b285-d166d9295462

src/bin/xfrin/TODO

@@ -65,4 +65,5 @@
     and then it would need some asynchronous communication mechanism.
 17. Do zone transfer from notifyfrom address first, if it's one master of the zone.
 18. Check soa serial first when doing zone refreshment.
+19. Add configuration items to seperate zone, including ACL, multiple masters, etc.