what is the best strategy to run kerberos on laptops?
	by "laptops", i mean:
	- we may not have IP address at all (modulo loopback)
	- IP address changes over time
	- i don't want kinit/login to stuck forever when there's no connectivity
	if you have a good way of doing it, please let me know...

	i tried to run slave kdc on laptop, and have "localhost" in
	/etc/krb5.conf, however the attempt was failed as seen on PR 11860.
	(database synchronization is another issue - it would be easier if
	we have a database synchronization tool which uses tcp session
	initiated by slave, not master...)

itojun