The director has the opportunity to change the configuration of AC in join
connection. The virtual interfaces which encapsulate the wifi stations is
managed dynamically by the Director.
The AC must request authorization from Director for associate a station.
Complete the IEEE802.11 Station Association with interation of AC in LocalMAC mode.
After the IEEE802.11 Authorization / Association is complete, the AC can now
authorize the WTP to accept data station packets with Station Configuration Message.
The virtual interfaces are created at the startup of the wtp to reduce the time
required to configure a wireless interface.
Applied some patches to build the WTP on OpenWRT trunk
