Update pipeline to pass variable to downstream job

Update piplines to allow CI_SCRIPTS_BRANCH variable to be used in
downstream jobs.

Fix: Update build pipelines to checkout code rather than using the git
plugin. This is due to a bug in the Jenkins git plugin that does not
fetch tags.

Signed-off-by: Colin Thorbinson <colin.thorbinson@arm.com>
Change-Id: I902496b0a96129fa25557e2051330cda8f4a0fd1
9 files changed