Wireless networks: WPA setup

From OpenBSD 4.4 onwards, we have WPA.

For wpa keys, use wpa-psk:

$ wpa-psk unwiredbsd mylongpassphase
0x7579c38e59faaa3b64bd8372e94f74fe7ae2e4e91af154c956a9bfd0240ac9d0

A WPA access point config:

up media autoselect mediaopt hostap mode 11b chan 6 nwid unwiredbsd \
 wpapsk $(wpa-psk unwiredbsd mylongpassphase)