Remove expired ports:
2020-06-20 net-mgmt/zabbix42-java: End of Life
2020-06-20 net-mgmt/zabbix42-server: End of Life
2020-06-20 sysutils/duplicity07: Uses deprecated version of Python
2020-06-20 net-mgmt/zabbix42-proxy: End of Life
2020-06-20 net-mgmt/zabbix42-agent: End of Life
2020-06-20 net-mgmt/zabbix42-frontend: End of Life