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2021-09-14T20:02:47.432637Z
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ipfw: Introduce dnctl

Introduce a link to the ipfw command, dnctl, for dummynet configuration.
dnctl only handles dummynet configuration, and is part of the effort to
support dummynet in pf.

/sbin/ipfw continues to accept pipe, queue and sched commands, but these can
now also be issued via the new dnctl command.

Reviewed by:	donner
MFC after:	2 weeks
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D30465

(cherry picked from commit 0b95680e077b7ef5bc6930c7c0f1a41106251d5d)

Git Hash:   18fecda9360530bd616af5181554122db111d96b
Git Author: kp@FreeBSD.org
END