kern/55691: rump kernels log "rn_init: radix functions require max_keylen be set"

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         55691
>Category:       kern
>Synopsis:       rump kernels log "rn_init: radix functions require max_keylen be set"
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 02 12:35:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

When running the ATF test suite, the output from atf-run (without any
processing by atf-report) contains about 200 messages like this one:

  rn_init: radix functions require max_keylen be set

These are printed by rump kernels.  This does not appear to be causing
any tests to fail, but the messages clutter the output, and they cause
confusion because when a test fails and logs an error message, it's
easy to incorrectly assume that the two are related.

>How-To-Repeat:

cd /usr/tests
atf-run | grep max_keylen

>Fix: