Clear DNS cache on network changes

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/java/com/owncloud/android/utils/ReceiversHelper.java

@@ -30,6 +30,7 @@ import android.content.IntentFilter;
 import com.nextcloud.client.account.UserAccountManager;
 import com.nextcloud.client.device.PowerManagementService;
 import com.nextcloud.client.network.ConnectivityService;
+import com.nextcloud.common.DNSCache;
 import com.owncloud.android.MainApp;
 import com.owncloud.android.datamodel.UploadsStorageManager;
 
@@ -55,6 +56,7 @@ public final class ReceiversHelper {
         BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
+                DNSCache.clear();
                 if (connectivityService.getConnectivity().isConnected()) {
                     FilesSyncHelper.restartJobsIfNeeded(uploadsStorageManager,
                                                         accountManager,