Remove expired ports:
2017-06-15 databases/pgpool-II: Deprecated by upstream; use database/pgpool instead
2017-06-15 databases/pgpool-II-30: Deprecated by upstream; use database/pgpool instead
2017-06-18 games/libgames-support: Superseded by libgnome-games-support, no longer used by anything
2017-06-22 net/sixxs-aiccu: SixXS shutdown on 2017-06-06, https://www.sixxs.net/sunset/
databases/pgpoolAdmin: depended on expired databases/pgpool-II and only supported PostgreSQL 9.2 which is will EOL in September 2017