I'll need to change rcmd() and friends for supporting rsh/rlogin
	over IPv6.  What I basically need to do for rcmd() is:
	- add rcmd_af(), which takes additional argument (address family).
	  see draft-ietf-ipngwg-rfc2292bis-01.txt about what it does.
	- rcmd() retains its behavior (uses IPv4 only).
	  it would call rcmd_af(..., AF_INET).

	for netbsd, we have rcmd() and orcmd(), to allow non-rsh protocol
	to be used.  It seems that we need to modify both.  Am I correct?

itojun