Resolve incompatability between depth and version

Git is unable to checkout the specified `version` when the repository is
cloned with a reduced history (`depth`).  However, if the repository is
already cloned, subsequent git module calls will update the repository
(default update=True), then properly checkout the specified `version`.
To allow the initial call to properly clone the specified `version`, at
the specified `depth`, this patch adds the `--branch` parameter when
cloning the repository.
Merge pull request #3578 from jlaska/git_branch

(git module) Resolve incompatability between depth and version