[0620] - Uldaman - Stonevault Rockchewer respawn & The Shaft of Tsol conditions

* The respawn timer of 'Staunevault Rockchewer' was changed to 2 hours up from
  10 minutes (just the ones inside the dungeon), to match their nearby friends.
* 'The Shaft of Tsol' no longer required the quest 'The hidden Chamber' to be taken
  or completed.