remove job settings for keystone repositories
remove job settings for keystone repositories

This is a mechanically generated patch to remove the job settings that
have been migrated to the git repositories owned by the keystone team.

See the python3-first goal document for details:
https://governance.openstack.org/tc/goals/stein/python3-first.html

Change-Id: Idddb4ae8ce64a9962a85e3d08883aa1fedeed489
Story: #2002586
Task: #24304

openstack-infra/project-config,openstack-infra/project-config