Horizon Object storage dashboard "Error: Unable to fetch security policies"

[Roman Krček]

After enabling swift in globals.yml with enable_swift: "yes" the horizon Object storage dashboard fails to load with error "Error: Unable to fetch security policies"

When looking at horizon-error.log, I saw errors when horizon was fetching openstack_ip:8080/info. It returned 401: Unauthorized. The underlying python-swiftclient that horizon uses doesnt use authentication to retrieve data from the /info endpoint.

I traced this back to the fact, that swift_proxy_server is set up in way that endpoint openstack_ip:8080/info requires authentication.
The /info endpoint requires authentication because delay_auth_decision is by default set to False in proxy-server.conf Documentation mentions that when set to False, the public access (that the python-swiftclient expects) is broken. https://docs.openstack.org/swift/latest/overview_auth.html (see the first Note)

swift_delay_auth_decision is set to True when using the S3 API, however in the documentation it is not mentioned that its required to get Swift working. https://github.com/openstack/kolla-ansible/blob/master/ansible/roles/swift/defaults/main.yml#L63