Two businessmen should have obtained court permission before they sued a bankruptcy trustee for allegedly breaking a promise to keep details about a financial dispute confidential, a federal judge ruled. In a written opinion, U.S. District Judge Matthew F. Kennelly did not rule on the merits of the allegation that Gus A. Paloian of Seyfarth, Shaw LLP violated a consent decree entered in litigation stemming from a bankruptcy filing by Restaurant Development Group. But Kennelly threw out the claim — included in …