Remove the wificfg_got_sta_connect() function and replace it with
wificfg_wait_until_sta_connected(). This replaces a probe function with a wait
function, and this better fits the wifi layer using an event model - the wait
function can wait on a station connection event before returning.
The shutdown hooks are call when the wificfg restart function is used. It can
be used to implement a cleaner restart, for example blocking further i2c and
flash operations.
* wificfg: remove the AP WEP mode option
The WEP mode does not appear to be implement in the sdk for the AP mode, and
defaults to open when WEP is requested which is probably not intended. Remove
the WEP option from the wifi config interface.
* lwip: enable mdns dns queries.
* wificfg: support mDNS on the softAP interface.
