[ot] checking out a git tag and only the tag

[Tom Zeller]

If I clone spring-framework, then 'git checkout tags/v3.2.6.RELEASE'
or 'git checkout v3.2.6.RELEASE', then the spring-beans-groovy
directory still exists, even though it does not exist in the tag,
AFAICT, according to github.

Just wondering what I need to type to checkout the tag and only the tag.