Germany may be getting cold feet about ending its oil reserve waiver. Berlin said this week it is considering extending a temporary reduction in national oil stockpiling requirements beyond the current August 31 deadline, even as markets celebrate the U.S.-Iran agreement and the expected reopening of the Strait of Hormuz. Officially, Germany insists there are no physical shortages. That's true. But governments generally don't keep discussing emergency measures when they're completely comfortable with the situation. Germany joined the International…