By Diane Bartz WASHINGTON (Reuters) – Two cases that give the U.S. Supreme Court’s conservative majority another opportunity to restrain the power of federal agencies go before the justices next week in disputes involving the Federal Trade Commission and Securities and Exchange Commission. The court has scheduled arguments on Monday in the cases, which represent the latest battles in what is sometimes called the legal “war on the administrative state” pursued by plaintiffs who accuse agencies of taking actions either not authorized by Congress or by the U.S. Constitution. The SEC’s job is to p…