K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2019-05-10T23:12:59.680760Z
K 7
svn:log
V 357
netdump: Ref the interface we're attached to

Serialize netdump configuration / deconfiguration, and discard our
configuration when the affiliated interface goes away by monitoring
ifnet_departure_event.

Reviewed by:	markj, with input from vangyzen@ (earlier version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D20206

END