Goal:

Add ability to use TopologySpreadConstraints and Affinity / Anti-Affinity to schedule the pods on specific nodes.

• infra-operator
• lib-common
• lib-common

Acceptance Criteria:

• Functional tests are created (as in https://github.com/openstack-k8s-operators/keystone-operator/blob/main/tests/functional/keystoneapi_controller_test.go#L1558 )
• Kuttl tests to validate  topologySpreadConstraints are applied to the statefulset.
• In crc-based jobs we can not test the actual behavior of the topology as it requires more that one master node to distribution of pods. However, in one of the existing jobs we can add a topology CR and add it as parameter to the Watcher CR. With that, at least we will know that the CR is properly handled.
• The storage team has been working in creating a DT for it. At some point, it would be good to have a DT to validate all the services.