[Bleeding] Send short version string on ping. Addresses BUKKIT-5206

With the update in 1.7 that improved the server ping, it was made to
include a long version string for CraftBukkit. This value is too long
for proper display so we now send a shortened string consisting of
the server implementation and the minecraft version.

src/main/java/net/minecraft/server/MinecraftServer.java

@@ -899,7 +899,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IMo
     }
 
     public String getServerModName() {
-        return "craftbukkit"; // CraftBukkit - cb > vanilla!
+        return server.getName(); // CraftBukkit - cb > vanilla!
     }
 
     public CrashReport b(CrashReport crashreport) {