Reduce the amount of server-side logging done by repeated unauthenticated connection attempts

Older versions of the Java client may not reauthenticate their tokens automatically. Upon connection to a server post-token-expiration, this leads to a wall of warnings in the logs. While helpful to see, it would be nice if this were not upon every unauthorized connection, particularly once KUDU-2497 is resolved.

It's worth noting that these warnings do contain valuable information: where the unauthorized connections coming from. It would be nice to maintain visibility into this.