Revert netty nativ support

@@ -17,8 +17,6 @@ import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.SimpleChannelInboundHandler;
-import io.netty.channel.epoll.EpollEventLoopGroup;
-import io.netty.channel.epoll.EpollSocketChannel;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
@@ -57,14 +55,9 @@ public class NettyMessagingService implements MessagingService {
 
     // TODO: make this configurable.
     private void initEventLoopGroup() {
-        try {
-            workerGroup = new EpollEventLoopGroup();
-            channelClass = EpollSocketChannel.class;
-        } catch (Throwable t) {
         workerGroup = new NioEventLoopGroup();
         channelClass = NioSocketChannel.class;
     }
-    }
 
     public NettyMessagingService() {
         // TODO: Default port should be configurable.