(Updates with Egypt, Saudi Arabia open) DUBAI, **v 25 (Reuters) - Stock markets in Saudi Arabia and Egypt fell in early trade on Tuesday while funds tracking MSCI's emerging markets index started buying several stocks in the United Arab Emirates and Qatar ahead of scheduled adjustments to the benchmark. Saudi Arabia's index fell 1.2 percent, with most stocks in the red. Saudi Basic Industries lost 1.2 percent, while food maker Savola Group and Al Rajhi Bank were down 2.9 and 1.1 percent respectively. Egypt's bourse slid 1.1 percent as Commercial International Bank fell 1. ...