Remove need for RCAP_TYPE_OLD_PROTOCOL

Some modules that parse the resultset require that the protocol version is fixed to the "base protocol" that MariaDB 10.1 and MySQL 5.6 use. The major difference in this is the lack of the DEPRECATE_EOF protocol but recent additions to MariaDB and MySQL are also not supported (e.g. metadata caching and extended types).

This is simply technical debt and the modules that do use it should be modified to use the features of the core that automatically support the newer protocols.