-import com.google.common.base.Optional;
-import com.google.common.base.Preconditions;
-import io.netty.channel.Channel;
-import io.netty.channel.ChannelHandler;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.handler.ssl.SslHandler;
-import io.netty.util.Timeout;
-import io.netty.util.Timer;
-import io.netty.util.TimerTask;
-import io.netty.util.concurrent.Future;
-import io.netty.util.concurrent.GenericFutureListener;
-import io.netty.util.concurrent.Promise;
+import java.util.concurrent.TimeUnit;
+
+import org.opendaylight.controller.netconf.api.AbstractNetconfSession;