HOUSTON/GEORGETOWN, May 30 (Reuters) - Guyana was already the world’s fastest growing economy before the U.S.-Israeli war on Iran drove up oil prices. Now, the tiny Caribbean nation of nearly 1 million people will reap an even bigger bonanza as the conflict reshapes global energy markets. The war that caused one of the largest energy disruptions in history highlights the growing importance of countries including Guyana that offer political stability and geographically unrestricted access to their estimated 11 billion barrels of oil reserves. This growing windfall from crude brings pressure from business owners and locals on the government to use...