interface name collisions

[Nikos Vassiliadis]

Hello,

  It seems that there is no checking for name collisions,
when an interface is claimed from a child vnet.

create ngeth0
> lab# ngctl mkpeer eiface ether ether
create test jail
> lab# jail -c persist vnet name=test
create ngeth0 at test
> lab# jexec test ngctl mkpeer eiface ether ether
claim ngeth0 at test
> lab# ifconfig ngeth0 -vnet test
> lab# ifconfig ngeth0
> ngeth0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         ether 00:00:00:00:00:00
>         ether 00:00:00:00:00:00
> lab#

Thanks in advance, Nikos