Configure IntraNought interface for FreeBSD

Summary:
VMWare EXSi VMs have two network card, one for the main network,
already configured, one for the IntraNought VM network, for private
communication.

Ref T1616

Test Plan:
Apply on router-001, ping from Dwellers:

$ ping 172.27.27.1
PING 172.27.27.1 (172.27.27.1) 56(84) bytes of data.
64 bytes from 172.27.27.1: icmp_seq=1 ttl=64 time=0.593 ms
64 bytes from 172.27.27.1: icmp_seq=2 ttl=64 time=0.289 ms
64 bytes from 172.27.27.1: icmp_seq=3 ttl=64 time=0.284 ms

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1616

Differential Revision: https://devcentral.nasqueron.org/D2334