Add IpManager#shutdown() to terminate the state machine.

    private static final boolean VDBG = false;

    /**

     * Callbacks for both configuration of IpManager and for handling

     * events as desired.

     * Callbacks for handling IpManager events.

     */

    public static class Callback {

        /**

         * Configuration callbacks.

         *

         * Override methods as desired in order to control which features

         * IpManager will use at run time.

         */

        // An IpReachabilityMonitor will always be started, if only for logging.

        // This method is checked before probing neighbors and before calling

        // onProvisioningLost() (see below).

        public boolean usingIpReachabilityMonitor() {

            return false;

        }

        /**

         * Event callbacks.

         *

         * Override methods as desired in order to handle event callbacks

         * as IpManager invokes them.

         */

        // Implementations must call IpManager#completedPreDhcpAction().

        // TODO: Remove this requirement, perhaps via some

        // registerForPreDhcpAction()-style mechanism.

        // In order to receive onPreDhcpAction(), call #withPreDhcpAction()

        // when constructing a ProvisioningConfiguration.

        //

        // Implementations of onPreDhcpAction() must call

        // IpManager#completedPreDhcpAction() to indicate that DHCP is clear

        // to proceed.

        public void onPreDhcpAction() {}

        public void onPostDhcpAction() {}

        // Called when the internal IpReachabilityMonitor (if enabled) has

        // detected the loss of a critical number of required neighbors.

        public void onReachabilityLost(String logMsg) {}

        // Called when the IpManager state machine terminates.

        public void onQuit() {}

    }

    /**

        mNetlinkTracker = null;

    }

    @Override

    protected void onQuitting() {

        mCallback.onQuit();

    }

    // Shut down this IpManager instance altogether.

    public void shutdown() {

        stop();

        quit();

    }

    public static ProvisioningConfiguration.Builder buildProvisioningConfiguration() {

        return new ProvisioningConfiguration.Builder();

    }