grafana-cli should allow configuration overrides to be received from the command line. e.g.

```
grafana-cli admin reset-password cfg:default.paths.logs=custom/log/directory/
```

Seems like we missed the inclusion of `flag.Parse` as we run the command,  to be able to consume them.

Additionally, it'll be useful for the user to know whenever these are being overriden or not - hence the addition of logging the configuration to be used as we run the command.