K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2019-03-05T13:21:07.579466Z
K 7
svn:log
V 952
tun: VIMAGE fix for if_tun cloner

The if_tun cloner is not virtualised, but if_clone_attach() does use a
virtualised list of cloners.
The result is that we can't find the if_tun cloner when we try to remove
a renamed tun interface. Virtualise the cloner, and move the final
cleanup into a sysuninit so that we're sure this happens after all of
the vnet_sysuninits

Note that we need unit numbers to be system-unique (rather than unique
per vnet, as is done by if_clone_simple()). The unit number is used to
create the corresponding /dev/tunX device node, and this node must match
with the interface.
Switch to if_clone_advanced() so that we have control over the unit
numbers.

Reproduction scenario:
	jail -c -n foo persist vnet
	jexec test ifconfig tun create
	jexec test ifconfig tun0 name wg0
	jexec test ifconfig wg0 destroy

PR:		235704
Reviewed by:	bz, hrs, hselasky
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D19248

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