Expand rdomain option to support FreeBSD fib

[Christian Weisgerber]

Paige Thompson via openssh-unix-dev:

> Could I or somebody add this in a future release?

That might be relatively simple, see this patch that replaces OpenBSD
rdomain with FreeBSD FIB support in OpenNTPD:

https://cgit.freebsd.org/ports/tree/net/openntpd/files/patch-src_server.c

(I don't have any time to work on this myself.)

-- 
Christian "naddy" Weisgerber                          naddy at mips.inka.de