Change 4954e284b9616f5e0c2cea77d94bbe18e0b8fd39 updated the redis
sentinel driver to apply auth/ssl settings for redis sentinel, based
on ones of redis, but this change broke the existing usage in kolla
deployments, which require redis with authentication enabled and
sentinel with authentication DISABLED.
This restores the old behavior, which do not enable authentication and
ssl for sentinel even when these for redis is enabled.
Closes-Bug: #2056656
Change-Id: I3047c80359df3dad64be041db6f4a3a6180479d6
3bce8e1dca