HCD-83 Enables IAuthenticator's to return own AuthenticateMessage #1582
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What is the issue
ClientState contains information about driver's name and version which could be used to determine the contents of the AuthenticateMessage that is sent back to the clients. This enables, for instance, returning driver's known authenticator implementations (e.g. DseAuthenticator) which enables SASL negotiation.
What does this PR fix and why was it fixed
Allows custom implementations of IAuthenticator to return their own AuthenticateMessage based on ClientState information.
This PR back-ports CASSANDRA-19984.