support connection to Redis-Cluster with TLS and non-default user.

[Alfred-Sabitzer]

Hi

Would be totally helpful to support connection to Redis-Cluster with TLS and non-default user.

Example (with real redis-cli):
REDIS_TLS=" --tls --cert /etc/ssl/certs/client.crt --key /etc/ssl/certs/client.key --cacert /etc/ssl/certs/ca.crt "
redis-cli -h ${MASTER_FDQN} -p 6379 ${REDIS_TLS} auth ${REDIS_USER} ${REDISCLI_AUTH}

BTW: Your solution is already totally cool, slim and easy to use. Like it!