Merge "Correct value of supported keepalive count for cellular" into qt-dev

 * {@link SocketKeepalive.Callback#onStopped} if the operation was successful or

 * {@link SocketKeepalive.Callback#onError} if an error occurred.

 *

 * The device SHOULD support keepalive offload. If it does not, it MUST reply with

 * For cellular, the device MUST support at least 1 keepalive slot.

 *

 * For WiFi, the device SHOULD support keepalive offload. If it does not, it MUST reply with

 * {@link SocketKeepalive.Callback#onError} with {@code ERROR_UNSUPPORTED} to any keepalive offload

 * request. If it does, it MUST support at least 3 concurrent keepalive slots per transport.

 * request. If it does, it MUST support at least 3 concurrent keepalive slots.

 */

public abstract class SocketKeepalive implements AutoCloseable {

    static final String TAG = "SocketKeepalive";

         overridden by the device to present the capability of creating socket keepalives. -->

    <!-- An Array of "[NetworkCapabilities.TRANSPORT_*],[supported keepalives] -->

    <string-array translatable="false" name="config_networkSupportedKeepaliveCount">

        <item>0,3</item>

        <item>0,1</item>

        <item>1,3</item>

    </string-array>