K 10
svn:author
V 2
bz
K 8
svn:date
V 27
2020-10-11T00:01:00.056610Z
K 7
svn:log
V 425
ip_mroute: fix the viftable export sysctl

It seems that in r354857 I got more than one thing wrong.
Convert the SYSCTL_OPAQUE to a SYSCTL_PROC to properly export the these
days allocated and not longer static per-vnet viftable array.
This fixes a problem with netstat -g which would show bogus information
for the IPv4 Virtual Interface Table.

PR:		246626
Reported by:	Ozkan KIRIK (ozkan.kirik gmail.com)
MFC after:	3 days

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