AH related fixes

Load items from memory instead of DB.
Fixes rebuild command functionality for ahbot and sets expired auctions ignored from update process.
Discussed here https://github.com/TrinityCore/TrinityCore/pull/13440#issuecomment-60424579

Fix item suffix search Closes #9196
Was not coded at all

It was used here: https://github.com/TrinityCore/TrinityCore/blob/6.x/src/server/game/AuctionHouse/AuctionHouseMgr.cpp#L478
So I thought Id change it for consistency. Though I dont think a 0 bid is possible.