GOCBC-198: Updated old RbacAuthenticator to new PasswordAuthenticator name.
GOCBC-198: Updated old RbacAuthenticator to new PasswordAuthenticator name.

Change-Id: I461a48a14242c8349af032e81a0f7a0f7a9f9676
Reviewed-on: http://review.couchbase.org/78073
Reviewed-by: Mark Nunberg <dab05a0fe859c5cb93882b2a75a0d613501b07be@couchbase.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/gocb