Update test_roles.py
Import file as of commit ad78e76d475960bd0a86c646734a40a98c79a6d9 in
OPS-Service/salt.git.
Noteable changes:
- allow nested roles, i.e. roles in subdirectories - this allows for
better grouping of related roles
Signed-off-by: Georg Pfuetzenreuter <georg.pfuetzenreuter@suse.com>