The AuthCenter will now wait for the RX thread to start before
continuing with the test.
Also removed the non blocking option and fixed the loop to
handle a blocking recvfrom call.
If the peer detects a sync error, it sends back AUTS. The
authentication center must then re-synchronize and update
the SQN it has saved for the given ISMI.
For testing purposes, it is useful to run hlrauc.py by itself
not including it from another python script like autotests do.
Better error checking was also added as testing can result in
badly formatted data.
Implemented milenage algorithm in hlrauc.py. Unlike EAP-SIM, the
authentication center must compute several values to give back
to the server (hostapd). This was already done by IWD as the peer
in EAP-AKA, but was also needed on the server side (HLR AuC).
