Fix for unknown 'kubernetes.io' or 'k8s.io' labels specified with --node-labels

[r0b2g1t]

During the initialization of the cluster Kubelet assigns the assignment of the node with the parameter --node-labels (node-role.kubernetes.io/master= or node-role.kubernetes.io/node=). The namespace prefix node-role is not available.

Feb 12 16:39:19 k8s-test-cluster-k8s-master-nf-1 kubelet: W0212 16:39:19.932837   23343 options.go:265] unknown 'kubernetes.io' or 'k8s.io' labels specified with --node-labels: [node-role.kubernetes.io/master]
Feb 12 16:39:19 k8s-test-cluster-k8s-master-nf-1 kubelet: W0212 16:39:19.932847   23343 options.go:266] in 1.15, --node-labels in the 'kubernetes.io' namespace must begin with an allowed prefix (kubelet.kubernetes.io, node.kubernetes.io) or be in the specifically allowed set (beta.kubernetes.io/arch, beta.kubernetes.io/instance-type, beta.kubernetes.io/os, failure-domain.beta.kubernetes.io/region, failure-domain.beta.kubernetes.io/zone, failure-domain.kubernetes.io/region, failure-domain.kubernetes.io/zone, kubernetes.io/arch, kubernetes.io/hostname, kubernetes.io/instance-type, kubernetes.io/os)

@Miouge1: I have to recreate the PR (#4220) for move the changes to a separate branch.

[Miouge1]

ci check this

[woopstar]

Needs a rebase

[r0b2g1t]

Needs a rebase

Rebase is done :-)

[woopstar]

/lgtm
/approve

[k8s-ci-robot]

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