Remove expired ports:
2016-03-01 net/samba4: not supported by the upstream
2016-03-01 net/isc-dhcp42-client: isc-dhcp 4.2 is End of Life
2016-03-01 net/isc-dhcp41-relay: isc-dhcp 4.1 is now End of Life
2016-03-01 net/isc-dhcp42-relay: isc-dhcp 4.2 is End of Life
2016-03-01 net/isc-dhcp41-client: isc-dhcp 4.1 is now End of Life
2016-03-01 net/isc-dhcp42-server: isc-dhcp 4.2 is End of Life
2016-03-01 devel/pear-IO_Bit: Unsupported upstream
2016-03-01 graphics/pear-IO_SWF: Unsupported upstream