Outputs the version to use with Maven. Following the following rules:
1. If this is an internal milestone, then 9.1.0-SNAPSHOT will be used.
2. If this is patch, then concatenate build number to product release version 9.1.0-RELEASE-7510
3. If this is GA, then just 9.1.0-RELEASE will be used.
4. If this is a final milestone, then 9.1.0-[MILESTONE] will be used.