The State Department is expected to announce the end of waivers for countries to import Iranian oil on Monday, part of the Trump administration’s effort to drive Iran’s exports to zero, people familiar with the decision said. The U.S. had previously granted eight countries a 180-day waiver to continue to buy Iranian crude despite U.S. sanctions, provided that each took steps to reduce purchases and move toward ending imports. The deadline for renewing the waivers was set to fall on May 2. …