LONDON (Reuters) - British Airways owner IAG said on Thursday it wouldn't make a new bid for Norwegian Air Shuttle and would sell its remaining stake in the company, sending shares in the budget carrier sharply lower.Shares in Norwegian dropped 20 percent after IAG's statement, hitting their lowest level since December 2012, while IAG turned positive and were trading up 1.1 percent in afternoon deals."International Airlines Group confirms that it does not intend to make an offer for Norwegian..