Added AUTH support for redis nodes/instances

Support for http://redis.io/commands/AUTH

```
...
"allServers": {
        "name": "All",
        "instances": [
            {
                "name": "Core (Q&A)",
                "port": "6379",
                "password": "your-password",
                "analysisRegexes": {
                    "**local**": "^local-",
                    "**dev**": "^dev-",
                    "**local**": "^local:",
                    "**dev**": "^dev:"
                }
            }
        ]
    }
...
```