Merge "Update Skyline configuration to enable SSO"

ansible/group_vars/all.yml

ansible/roles/keystone/defaults/main.yml

ansible/roles/skyline/defaults/main.yml

ansible/roles/skyline/templates/skyline.yaml.j2

doc/source/reference/shared-services/index.rst

doc/source/reference/shared-services/skyline-guide.rst

releasenotes/notes/skyline-sso-2036301-9a2118472dd0d8cf.yaml

tests/run.yml

tests/templates/globals-default.j2

tests/test-skyline-sso.sh

tests/test-skyline.sh

zuul.d/base.yaml

zuul.d/jobs.yaml

zuul.d/project.yaml