This allows one to manage a file separately from the service definition
and simply restart the service once the configured file is updated.

dd flag -redis.alias. Allow to give an alias to the redis node(s) address. It could be more friendly (especially in graph) to display the alias than just the node address. Add a modified dashboard for Grafana.

Adds the "redis.password" flag, which allows for authenticating
connections to the Redis server or servers. This flag defaults
to the environment variable `REDIS_PASSWORD`.

To simplify the function signatures, a RedisHost structure was implemented
to contain all information about the connection to Redis.