- Add an warning when ifconfig_IF_ipv6 has no inet6 keyword in front   of an IPv6 address. (r225489)
- Add an warning when ifconfig_IF_ipv6 has no inet6 keyword in front
  of an IPv6 address. (r225489)

- Use eval for ${ifconfig_args} to fix an issue fixed in r223506. (r225489)

Approved by:	re (bz)

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