Merge "Add logging for waiting device to reboot"

        # sys.boot_completed.

        while time.time() < timeout_start + timeout:

            try:

                logging.debug("waiting for device %s to turn off", self.serial_number)

                self.adb.get_state()

                logging.debug("device %s not turned off yet", self.serial_number)

                time.sleep(.1)

            except AdbError:

                # get_state will raise an error if the device is not found. We

                # want the device to be missing to prove the device has kicked

                # off the reboot.

                logging.debug("device %s is turned off, waiting for it to boot", self.serial_number)

                break

        minutes_left = timeout_minutes - (time.time() - timeout_start) / 60.0

        self.wait_for_boot_completion(timeout_minutes=minutes_left)