Idle session timeout for secure environments

A thread on the user list pointed out that some use cases may prefer to have a database disconnect sessions after some idle timeout. An example would be an administrator who connected via ssh+cqlsh and then walked away. Disconnecting that user and forcing it to re-authenticate could protect against unauthorized access.

It seems like it may be possible to do this using a netty IdleStateHandler in a way that's low risk and perhaps off by default.