style: group together CODE_REPO and CI_SCRIPTS_* variables

It's a cosmetic change without functional changes.
Grouping together related variables in order to improve readability and
make it easier to update/change CI scripts location.
e.g. for testing purpose on TF staging instance

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: I123ca5b1fee5130578f531c89fda4f5be7a39c62
14 files changed