Rename the Domain Manager role to "manager"

[markus-hentsch]

This implements our decision to rename the role¹ to follow the request by upstream².

Footnotes

1. https://github.com/SovereignCloudStack/minutes/blob/main/iaas/20240313.md#domain-manager-rolepersona-markus-hentsch ↩

2. https://review.opendev.org/c/openstack/keystone-specs/+/903172/2/specs/keystone/2023.1/domain-manager-role.rst#20 ↩

[markus-hentsch]

Need to test the changed test script implementation but need a suitable test Keystone instance first.

Marking as draft for now.

[markus-hentsch]

Need to test the changed test script implementation but need a suitable test Keystone instance first.

I've now successfully verified that it works the same using the manager role and the tests still pass.
Verified using a minimal DevStack I built up as documented here: https://gist.github.com/markus-hentsch/b0f7315a9ad6f5dc8621727056df275e

Before removing the draft state I need to also create a corresponding PR for the docs at https://docs.scs.community/docs/iam/domain-manager-setup-and-usage/

[markus-hentsch]

Before removing the draft state I need to also create a corresponding PR for the docs at https://docs.scs.community/docs/iam/domain-manager-setup-and-usage/

Done: SovereignCloudStack/docs#163

[josephineSei]

I found a few places, that are still mentioning the role.
It would be good to add a definition of role and persona in the beginning or the glossary.

[josephineSei]

LGTM