git: eventhandler: Implement ifnet_link_event

[Aaron LI]

commit bc1a39e222197cb9e98ed508f3994662d5d3fc75
Author: Aaron LI <aly at aaronly.me>
Date:   Mon Jun 25 17:04:41 2018 +0800

    eventhandler: Implement ifnet_link_event
    
    The "ifnet_link_event" is triggered by the change of the link state of
    an interface.
    
    Taken-from: FreeBSD

Summary of changes:
 share/man/man9/EVENTHANDLER.9 | 2 ++
 sys/net/if.c                  | 2 ++
 sys/net/if_var.h              | 3 +++
 3 files changed, 7 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/bc1a39e222197cb9e98ed508f3994662d5d3fc75


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