Harshavardhana 8b272a3163 config: Improve config migrate messaging. (#4216)
Previous message

```
Migration from version ‘17’ to ‘18’ completed successfully.
```

For example didn't provide any meaningful insights.

This PR attempts to improve this message as below

```
Configuration file '/home/harsha/.minio/config.json' migrated from version '17' to '18' successfully.
```

Fixes #4199
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