Add a timeout for disconnecting devices to recover from error situation

Start the timer (3 second) just after calling disconnect devices.
If the timer expires, it indicates an error condition. we don't wait
on the ALL_DEVICES_DISCONNECTED event upon the error. Instead, get out of
switching state and turn off BT to reset out of the error condition.

Change-Id: I27aa8cd7b6fe50d9191e2d32fc2d6eac50424403