Minor bug fixes for caching_sha2_password auth logic
#390
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For accounts without passwords, we need to account for the client sending the null byte when the server re-requests the client auth data, and then skip the
AuthMoreDataPacket, andCachingSha2FastAuthpackets. Otherwise themysqlclient errors with "Malformed packet".handleConnectionErroris used to report stats about failed connection attempts, but wasn't being called in the correct spot. The previous spot was over counting failed connection attempts, since it was called as part of the auth renegotiation flow. It has been moved to be called whenever we return an error or exit the function without a successful connection.