Creature/Scripts: Add Aggro sound to Cairne Bloodhoo, Sylvanas Windrunner and Thrall

(cherry picked from commit 48ecd81d61)

src/server/scripts/EasternKingdoms/zone_undercity.cpp

@@ -80,6 +80,11 @@ enum Sylvanas
     GUID_EVENT_INVOKER              = 1,
 };
 
+enum Sounds
+{
+    SOUND_AGGRO                     = 5886
+};
+
 float HighborneLoc[4][3]=
 {
     {1285.41f, 312.47f, 0.51f},
@@ -118,6 +123,7 @@ public:
 
         void EnterCombat(Unit* /*who*/) override
         {
+            DoPlaySoundToSet(me, SOUND_AGGRO);
             _events.ScheduleEvent(EVENT_FADE, 30000);
             _events.ScheduleEvent(EVENT_SUMMON_SKELETON, 20000);
             _events.ScheduleEvent(EVENT_BLACK_ARROW, 15000);

src/server/scripts/Kalimdor/zone_thunder_bluff.cpp

@@ -40,6 +40,11 @@ enum CairneBloodhoof
     SPELL_UPPERCUT          = 22916
 };
 
+enum Sounds
+{
+    SOUND_AGGRO             = 5884
+};
+
 #define GOSSIP_HCB "I know this is rather silly but a young ward who is a bit shy would like your hoofprint."
 /// @todo verify abilities/timers
 class npc_cairne_bloodhoof : public CreatureScript
@@ -74,7 +79,10 @@ public:
             Initialize();
         }
 
-        void EnterCombat(Unit* /*who*/) override { }
+        void EnterCombat(Unit* /*who*/) override
+        {
+            DoPlaySoundToSet(me, SOUND_AGGRO);
+        }
 
         void UpdateAI(uint32 diff) override
         {