Bring back kqueue transport from the dead

My PR to AsyncHttpClient was accepted and 2.10.4 was released with it
included.

proxy/build.gradle

@@ -48,6 +48,8 @@ dependencies {
     compile "io.netty:netty-handler:${nettyVersion}"
     compile "io.netty:netty-transport-native-epoll:${nettyVersion}"
     compile "io.netty:netty-transport-native-epoll:${nettyVersion}:linux-x86_64"
+    compile "io.netty:netty-transport-native-kqueue:${nettyVersion}"
+    compile "io.netty:netty-transport-native-kqueue:${nettyVersion}:osx-x86_64"
     compile "io.netty:netty-resolver-dns:${nettyVersion}"
 
     compile "org.apache.logging.log4j:log4j-api:${log4jVersion}"
@@ -65,7 +67,7 @@ dependencies {
 
     compile 'com.mojang:brigadier:1.0.15'
     
-    compile 'org.asynchttpclient:async-http-client:2.10.1'
+    compile 'org.asynchttpclient:async-http-client:2.10.4'
     
     compile 'com.spotify:completable-futures:0.3.2'
 

proxy/src/main/java/com/velocitypowered/proxy/network/TransportType.java

@@ -7,6 +7,11 @@ import io.netty.channel.epoll.EpollDatagramChannel;
 import io.netty.channel.epoll.EpollEventLoopGroup;
 import io.netty.channel.epoll.EpollServerSocketChannel;
 import io.netty.channel.epoll.EpollSocketChannel;
+import io.netty.channel.kqueue.KQueue;
+import io.netty.channel.kqueue.KQueueDatagramChannel;
+import io.netty.channel.kqueue.KQueueEventLoopGroup;
+import io.netty.channel.kqueue.KQueueServerSocketChannel;
+import io.netty.channel.kqueue.KQueueSocketChannel;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.DatagramChannel;
 import io.netty.channel.socket.ServerSocketChannel;
@@ -22,7 +27,11 @@ enum TransportType {
       (name, type) -> new NioEventLoopGroup(0, createThreadFactory(name, type))),
   EPOLL("epoll", EpollServerSocketChannel.class, EpollSocketChannel.class,
       EpollDatagramChannel.class,
-      (name, type) -> new EpollEventLoopGroup(0, createThreadFactory(name, type)));
+      (name, type) -> new EpollEventLoopGroup(0, createThreadFactory(name, type))),
+  KQUEUE("Kqueue", KQueueServerSocketChannel.class, KQueueSocketChannel.class,
+      KQueueDatagramChannel.class,
+      (name, type) -> new KQueueEventLoopGroup(0, createThreadFactory(name, type)));
+
 
   final String name;
   final Class<? extends ServerSocketChannel> serverSocketChannelClass;
@@ -62,6 +71,8 @@ enum TransportType {
 
     if (Epoll.isAvailable()) {
       return EPOLL;
+    } else if (KQueue.isAvailable()) {
+      return KQUEUE;
     } else {
       return NIO;
     }