DB/Creature: Demon trainers

By Killyana, closes #12559

sql/updates/world/2015_06_06_13_world_335.sql

@@ -0,0 +1,4 @@
+--
+UPDATE `creature_template` SET `gossip_menu_id`=0 WHERE `entry`IN (23535, 5753, 5750, 5749, 16649, 16267, 15494, 5815, 6027, 12776, 6374, 5520, 6382, 6328, 6373, 6376);
+UPDATE `creature_template` SET `npcflag`=0 WHERE `entry`IN (16267, 6328, 6373, 15494, 6374);
+UPDATE `creature_template` SET `npcflag`=2 WHERE `entry`IN (6027, 5753, 5750, 5520, 6376, 6382, 12776, 5749, 5815, 16649, 23535);