Add routing_test:static_ipv6_loopback_route_for_each_fib.
It tests that all FIBs get a static IPv6 loopback route.

Submitted by: asomers
MFC after: 1 week
Sponsored by: Spectra Logic
MFSpectraBSD: 1048456 on 2014/03/13

		1114523 on 2015/01/23