MIDEAST STOCKS-Saudi slips as Yemen urges ground intervention; Egypt up

(Updates with Saudi Arabia, Egypt open) DUBAI, May 7 (Reuters) - Saudi Arabia's stock market edged down in early trade on Thursday after Yemen's government called for military intervention on the ground, a move that could further escalate the conflict in which Riyadh plays a leading role. Yemen urged the international community "to quickly intervene by land forces to save" the country, specifically in the cities of Aden and Taiz, according to a letter sent to the United Nations Security Council