We already supported role based api access control, this series patches
will implement resource access control for mistral, so that
administrator could define the rules of resource accessibility, e.g.
admin user could get/delete/update the workflows of other tenants
according to the policy.
TODO:
- Implement update workflow by admin
- Implement delete workflow by admin
- Implement for other resources(workfbook/execution/task/action, etc.)
Partially implements: blueprint mistral-rbac
Change-Id: I8b00e8a260a74457ad037ee7322a7cba9ae34fab