NodeJS driver doesn't support transitional authentication

When DSE cluster is running in transitional authentication mode, applications may omit credentials - this simplifies migration of applications to a more secure environment.

Unfortunately, Node.js driver throws exception when no credentials provided.

It would be useful to support transitional authentication, like it was done in https://datastax-oss.atlassian.net/browse/JAVA-1578#icft=JAVA-1578