If a beacon is received in RUN state, reset the management timer.

Some wifi drivers send a probe request if the hardware reports "missed beacon"
events. If the AP replies with a probe response it is still servicing us and
there is no need to search for a new AP. However, the management timer was not
reset if a beacon was received while in RUN state. So the interface watchdog
always ended up putting the driver into SCAN state after a missed beacon event,
even if the AP did respond to our probe request. Under some conditions this
bug would cause spurious disconnects.

Problem reported and fix tested by mlarkin@

(Using the management timer in RUN state is a new convention. Before support
for missed beacons was added, this timer was only used during the association
sequence to handle APs which don't respond to our assoc requests and such.)

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