Set default value for IMAGE_OS to ubuntu for k8s upgrade tests

Change-Id: I58e622b331361e39c456c496e638fcece83cc072
Signed-off-by: Sunnatillo <sunnat.samadov@est.tech>
2 files changed
tree: 7a35f02ef42ead38d548306c25d8da3ce302894a
  1. jjb/
  2. .gitignore
  3. .gitreview
  4. .yamllint
  5. tox.ini