In some usecases, we want to be able to clone a single branch
of a repository, without using --depth (which implies --single-branch).
* Use branch name when available
- update description of parameter
- consolidate branch or tag checking for easy reuse
* Add changelog
* Use static task imports rather than dynamic includes
* Add integration tests for single_branch
* Account for older versions of git
* Minor tweak to warnings
Co-authored-by: Laurent Coustet <laurent.coustet@clarisys.fr>
Co-authored-by: Sam Doran <sdoran@redhat.com>
