The manager of a chicken farm and pavilion-style restaurant in Haymarket, Virginia, that was raided by the FBI in January has pleaded guilty to firearms and drug trafficking charges, according to court records. Jorge Steve Zepeda Irias managed the now-closed 38-acre Rancho Los Cerritos and operated the Salvadoran-style restaurant on U.S. 15 in Haymarket. The farm and restaurant have remained closed since FBI raids on Jan. 21 and 22. Authorities …