fibs: Limit the WARNING message to only once when setting up with multiple fibs

In main [1] this warning message is suppressed but no plans to MFC the
change as the message may be still useful for u

fibs: Limit the WARNING message to only once when setting up with multiple fibs

In main [1] this warning message is suppressed but no plans to MFC the
change as the message may be still useful for users that upgrade from
older releases to 14.x or 13.x. Well emitting this warning message every
time increasing the fib number is confusing for users not for the feature
`net.add_addr_allfibs`, let's limit it to be printed only once.

1. a48f7a2eb90b fibs: Suppress the WARNING message for setups with multiple fibs

This is a direct commit to stable/14 and stable/13.

PR: 280097
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D46204

show more ...

route: Wrap long lines

No functional change intended.

MFC after: 1 week
Sponsored by: Klara, Inc.

(cherry picked from commit ec1b18c7353ad20d2d373e58931aeccfccd5599d)