HypervisorMaintenance: Trigger eviction based on maintenance flag

[fwiesel]

When maintenance is set, it will trigger an eviction via the respective CRD and reflect the result back to the hypervisor status.

[notandy]

I think we need to have a call about this implementation.
The controller want's to take care of:

• Eviction condition
• the evicted status field probably makes also most sense in the eviction controller itself
• ready status
  and conflicts with the other controllers, but it doesn't cleanup / remove stuff from other controllers. This feels too complex to be reviewed by me currently

[fwiesel]

I've used semantic equality, as controller-runtime also switched to that. I vaguely had in the back of my mind that there was some problem with reflect.DeepEqual(), that's why I looked it up. (Not that it would matter for our use-case really).

[github-actions]

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/api/v1	0.00% (ø)
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller	39.71% (+1.46%)	👍

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/api/v1/hypervisor_types.go	0.00% (ø)	0	0	0
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/hypervisor_maintenance_controller.go	71.60% (+4.94%)	81 (+39)	58 (+30)	23 (+9)	👍

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/hypervisor_maintenance_controller_test.go