git: eventhandler: Implement ifnet_event

[Aaron LI]

commit fcddd1b6c3b2924a8a022caf183b8f186e7d5cae
Author: Aaron LI <aly at aaronly.me>
Date:   Mon Jun 25 17:00:21 2018 +0800

    eventhandler: Implement ifnet_event
    
    Implement the "ifnet_event" which is triggered on interface up and down.
    
    Taken-from: FreeBSD

Summary of changes:
 share/man/man9/EVENTHANDLER.9 | 4 +++-
 sys/net/if.c                  | 2 ++
 sys/net/if_var.h              | 5 +++++
 3 files changed, 10 insertions(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/fcddd1b6c3b2924a8a022caf183b8f186e7d5cae


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