Add the non SLAAC IPv6 addresses for bastions

network.pp only had the IPv6 SLAAC addresses for bastions. Bastions also
have non-SLAAC IPv6 addresses, so add them in network.pp. Also put a
comment to indicate SLAAC IPv6 addresses.

Change-Id: Ia83a9f1bdb281f1bb6de79894adfd4bc759cdf58