Fix persistence on tamed pets. Fixes BUKKIT-3300

With the persistence api introduced, pets did not have their
persistence flag updated to reflect their persistence. This caused
tame ocelots to not persist under specific conditions.

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

@@ -30,7 +30,7 @@ import org.bukkit.plugin.PluginManager;
 public abstract class Entity {
 
     // CraftBukkit start
-    private static final int CURRENT_LEVEL = 1;
+    private static final int CURRENT_LEVEL = 2;
     static boolean isLevelAtLeast(NBTTagCompound tag, int level) {
         return tag.hasKey("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
     }
@@ -1162,6 +1162,11 @@ public abstract class Entity {
                 if (!nbttagcompound.hasKey("Bukkit.MaxHealth")) {
                     entity.maxHealth = entity.getMaxHealth();
                 }
+
+                // Reset the persistence for tamed animals
+                if (entity instanceof EntityTameableAnimal && !isLevelAtLeast(nbttagcompound, 2) && !nbttagcompound.getBoolean("PersistenceRequired")) {
+                    entity.persistent = !entity.bj();
+                }
             }
             // CraftBukkit end
 

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

@@ -76,7 +76,8 @@ public class EntityWolf extends EntityTameableAnimal {
     }
 
     protected boolean bj() {
-        return this.isAngry();
+        // CraftBukkit - added && !this.isTamed()
+        return this.isAngry() && !this.isTamed();
     }
 
     protected String aY() {

src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -236,6 +236,8 @@ public class CraftEventFactory {
         org.bukkit.entity.AnimalTamer bukkitTamer = (tamer != null ? (AnimalTamer) tamer.getBukkitEntity() : null);
         CraftServer craftServer = (CraftServer) bukkitEntity.getServer();
 
+        entity.persistent = true;
+
         EntityTameEvent event = new EntityTameEvent((LivingEntity) bukkitEntity, bukkitTamer);
         craftServer.getPluginManager().callEvent(event);
         return event;