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36ec43a262
This change introduces system.clients table, which provides information about CQL clients connected. PK is the client's IP address, CK consists of outgoing port number and client_type (which will be extended in future to thrift/alternator/redis). Table supplies also shard_id and username. Other columns, like connection_stage, driver_name, driver_version..., are currently empty but exist for C* compatibility and future use. This is an ordinary table (i.e. non-virtual) and it's updated upon accepting connections. This is also why C*'s column request_count was not introduced. In case of abrupt DB stop, the table should not persist, so it's being truncated on startup. Resolves #4820