Update key handling:
o use proper api for setting/deleting keys instead of depending

on key indices

o check mac address to decide whether a key is unicast or group/global
o check set_tx on key set to decide whether a group/global key should

also be marked as default

o explicitly set IEEE80211_KEY_GROUP flag for group keys instead of

depending on kernel auto-add kludge

With the above changes static wep key handling works.

Reviewed by: avatar
Approved by: re (scottl)