Add a wpa_supplicant rc script and bring in code to handle "WPA" in an
ifconfig_blah0="..." line in rc.conf. It should now be possible to bring
up a wireless interface with a line similar to:
ifconfig_iwi0="up WPA DHCP"
This commit also removes the restriction that when "DHCP" was specified,
the rest of the arguments were ignored. So the following should work now:
ifconfig_rl0="DHCP media 10baseT/UTP"
The commit also adds rc settings for interface renaming, e.g.:
ifconfig_iwi0_name="net0"
ifconfig_net0="up WPA DHCP"
Obtained-from: FreeBSD