Renove faith(4) and faithd(8) from base. It looks like industry
have chosen different (and more traditional) stateless/statuful
NAT64 as translation mechanism. Last non-trivial commits to both
faith(4) and faithd(8) happened more than 12 years ago, so I assume
it is time to drop RFC3142 in FreeBSD.

No objections from:	net@


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274331 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f