workload-automation: do not create local branch of WA

When checking out WA code from github, don't create local branch. This
will result with repository in detached head state but will allow to
checkout remote branches. Since it is known what was checked out, it's
easy to reproduce locally and the change will not make any difference
for test execution.

Change-Id: Iff4493300c9bb195a81b5618eb43207c8b71076d
Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
2 files changed