Here’s a sign of the changing times — Muslim cabbies now have their very own place at San Francisco International Airport to wash their hands and feet before they pray. Under Islamic law, Muslims are required to pray five times a day — a ritual that also calls for a ceremonial cleansing. For many cab drivers, that’s meant either lugging bottled water around or using one of the bathrooms inside the terminal to wash — a practice not always welcomed by airport passengers. So Royal Cab driver Hasan Khan, 52, a Pakistani immigrant, collected some 300 signatures from fellow cabbies,...