Keep list of lagg ports sorted by if_index.

Obtained from:	Yandex LLC
MFC after:	1 week
Sponsored by:	Yandex LLC


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272176 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
drop unnecessary ifdef IPSEC's.  This file is only compiled when IPSEC
is defined...

Differential Revision:	D839
Reviewed by:	bz, glebius, gnn
Sponsered by:	EuroBSDCon DevSummit


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272177 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Make all lagg protocol methods live in lagg_protos, not in softc. All
interfaces of a same protocol, use the same methods.

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272178 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f