By David Brunnstrom and John IrishApril 2 (Reuters) - The U.N. Security Council is to vote on a Bahraini resolution to protect commercial shipping in and around the Strait of Hormuz, diplomats said on Friday, but veto-wielding China made clear its opposition to authorizing any use of force.Two diplomats said the meeting of the Council's 15 members and the vote were set for Saturday morning, rather than Friday as earlier planned. Friday is a U.N. holiday.