Ensure that ansible-galaxy version can be a branch, a tag, or any tree-ish
supported by git including specific commit IDs. For git scm roles, adds an
explicit git checkout of the specified role_version prior to the git archive.
This means that we'll always archive from HEAD of whatever role_version is
checked out. role_version can be a branch, a tag, or any <tree-ish> supported
by git including specific commit IDs. These changes also ensure
ansible-galaxy works for scm clones when specified version differs from
repository default branch.
better error reporting on fetching errors
use scm if it exists over src
unified functions in requirements
simplified logic
added verbose to tests
cleanup code refs, unused options and dead code
moved get_opt to base class
fixes#11920fixes#12612fixes#10454
