Remove expired ports:

2020-12-12 comms/py-libconcord: Uses deprecated version of python
2020-12-12 databases/py-swift: Uses deprecated version of python
2020-12-12 devel/py-AddOns: Uses deprecated version of python
2020-12-12 devel/py-BytecodeAssembler: Uses deprecated version of python
2020-12-12 devel/py-repoze.who-testutil: Uses deprecated version of python
2020-12-12 devel/py-riak_pb: Uses deprecated version of python
2020-12-12 devel/pythk: Uses deprecated version of python
2020-12-12 mail/py-spambayes: Uses deprecated version of python
2020-12-12 math/py-numeric: Uses deprecated version of python
2020-12-12 math/py-scientific: Uses deprecated version of python
2020-12-12 net/py-suds: Uses deprecated version of python
2020-12-12 net/pynids: Uses deprecated version of python
2020-12-12 security/py-obfsproxy-tor: Uses deprecated version of python
2020-12-12 sysutils/syslog-ng324: Agreed upon upstream one year deprecation policy
2020-12-12 www/py-pylons: Uses deprecated version of python
2020-12-12 www/py-qpy: Uses deprecated version of python