fix(core): prevent empty tsc labels on nodes

[diafour]

Description

• Update kube-api-rewriter to v0.2.1
• Update 3p-kubevirt to v1.6.2-v12n.31 with updated kube-api-rewriter

See:

• fix: support null values in strategic patches kube-api-rewriter#7
• fix: prevent empty labels on nodes 3p-kubevirt#110

Why do we need it, and what problem does it solve?

null value for label in the strategic patch means "delete property", but kube-api-rewriter change those nulls to empty strings, so Nodes was labeled with unneeded empty tsc labels.

What is the expected result?

Before:

Stale labels are keeped on node:

      cpu-timer.node.virtualization.deckhouse.io/tsc-frequency: "4192126000"
      cpu-timer.node.virtualization.deckhouse.io/tsc-scalable: "true"
      kubevirt.internal.virtualization.deckhouse.io/schedulable: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-3599997000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-3599998000: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-3599999000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-3600000000: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4191797000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192043000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192085000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192103000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192104000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192106000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192107000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192115000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192121000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192122000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192123000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192124000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192125000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192126000: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192128000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192130000: ""
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192259000: ""

After:

Rewrite now keep nulls for strategic patch, no stale labels on nodes:

      cpu-timer.node.virtualization.deckhouse.io/tsc-frequency: "4192126000"
      cpu-timer.node.virtualization.deckhouse.io/tsc-scalable: "true"
      kubevirt.internal.virtualization.deckhouse.io/schedulable: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-3599998000: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-3600000000: "true"
      scheduling.node.virtualization.deckhouse.io/tsc-frequency-4192126000: "true"

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: core
type: fix
summary: Prevent empty tsc labels on Nodes.

[diafour]

Do not forget to change after tagging 3p-kubevirt!