removing RIP/RIPng (routed/route6d)

hello,

currently FreeBSD ships routed(8) and route6d(8) which implement the RIP
resp. RIPng routing protocols.

many years ago, it was fairly common for hosts to run these protocols to
get their routing table and it made sense to ship an implementation with
the operating systems.

nowadays, these are fairly niche protocols and have been replaced in
most networks by either static routing tables (mostly just a default
route) or more modern routing protocols like IBGP/EBGP, OSPF or IS-IS.
as such, i'm not convinced there's any value continuing to ship these
with the OS.

for people who do want to continue running RIP/RIPng, there are several
implementations available in ports, such as net/bird2 and net/quagga.

i'd like to submit a patch to remove both of these daemons from src.  if
there's some concern that people still want to use the BSD
implementation of routed/route6d, i'm also willing to submit a port such
as net/freebsd-routed containing the old code, in a similar way to how
the removal of things like window(1) and telnetd(8) were handled.

does anyone have an opinion on this?