Fix user authentication stalls when using db queries for eap-aka/eap-sim

[Frederic Leroy]

Using EAP-SIM database/authentication gateway interface, if the database
don't respond, hostapd will keep the user session pending at the db
query. Further authentication will fail as the state machine is still
waiting for the database.
The first patch of this series adds a 1 second timeout in order to
release the database pending time in unit of seconds.
The second patch makes this timeout user configurable in hostapd.conf.

Regards,

-- 
Fr?d?ric LEROY