The council shall provide by ordinance for the appointment of all county boards, committees and commissions whose appointment is not provided for by the general law or the Constitution. Each council shall have such appointive powers with regard to existing boards and commissions as may be authorized by the General Assembly except as otherwise provided for by the general law and the Constitution, but this authority shall not extend to school districts, special purpose districts or other political subdivisions created by the General Assembly; provided, however, that beginning January 1, 1980, the council shall provide by ordinance for the appointment of all county boards, committees and commissions whose appointment is not provided for by the general law or the Constitution, but this authority shall not extend to school districts, special purpose districts or other political subdivisions created by the General Assembly.