Display an nd6 line when the interface has ND6_IFF_ACCEPT_RTADV and no inet6 address.  This change should be useful for SLAAC-only interfaces.
Display an nd6 line when the interface has ND6_IFF_ACCEPT_RTADV and no
inet6 address.  This change should be useful for SLAAC-only interfaces.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase