Special case Keep Alive packets from Anti Xray

If a server enables Anti Xray, packet sending can be delayed until the
chunk has been obfuscated, blocking the entire queue from going out.

On a busy server, considering Anti Xray can only operate on a single
thread, it is quite possible the obfuscation backlog can get quite behind
resulting in a delay of sending packets.

And logging in is a clear area where lots of chunks are going to be queued
for obfuscation....

We should probably special case a few more than this (such as chat),
but this will hopefully help the keep alive issues some people run into.

Spigot-API-Patches/0039-Allow-Reloading-of-Command-Aliases.patch

@@ -1,4 +1,4 @@
-From d911fa59c930a36aa9c0ca24f9741fdedfecc6cb Mon Sep 17 00:00:00 2001
+From dad171c74df2dc24940141bce47acdc433258603 Mon Sep 17 00:00:00 2001
 From: willies952002 <admin@domnian.com>
 Date: Mon, 28 Nov 2016 10:16:39 -0500
 Subject: [PATCH] Allow Reloading of Command Aliases
@@ -72,7 +72,7 @@ index adfc7aae2..460fda05a 100644
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/command/defaults/ReloadCommand.java b/src/main/java/org/bukkit/command/defaults/ReloadCommand.java
-index c62da4131..af8ab73fe 100644
+index c62da4131..0c7ba0718 100644
 --- a/src/main/java/org/bukkit/command/defaults/ReloadCommand.java
 +++ b/src/main/java/org/bukkit/command/defaults/ReloadCommand.java
 @@ -13,7 +13,7 @@ public class ReloadCommand extends BukkitCommand {
@@ -98,6 +98,14 @@ index c62da4131..af8ab73fe 100644
              } else if ("confirm".equalsIgnoreCase(args[0])) {
                  confirmed = true;
              } else {
+@@ -53,6 +60,6 @@ public class ReloadCommand extends BukkitCommand {
+     @NotNull
+     @Override
+     public List<String> tabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException {
+-        return java.util.Collections.singletonList("permissions"); // Paper
++        return com.google.common.collect.Lists.newArrayList("permissions", "commands"); // Paper
+     }
+ }
 -- 
 2.26.2