allow to set the kubernetes log level

[aojea]

allow to configure the verbosity of the logs on the kubernetes components.

Ref kubernetes-sigs/kind#1750

Necessary to help debugging kubernetes/kubernetes#127721

[aojea]

/assign @dims

[k8s-ci-robot]

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[aojea]

I see

+ [[ false == true ]]
+ sed -i 's|{{BOOTSTRAP_TOKEN}}|eac9lf.w8pfcb1pvey46iow|g' /etc/kubernetes/kubeadm-join.yaml
+ sed -i 's|{{KUBEADM_CONTROL_PLANE_IP}}|172.31.19.193|g' /etc/kubernetes/kubeadm-join.yaml
+ kubeadm join --v 10 --config /etc/kubernetes/kubeadm-join.yaml
I1027 09:48:36.855288   16364 join.go:421] [preflight] found NodeName empty; using OS hostname as NodeName
I1027 09:48:36.855337   16364 joinconfiguration.go:83] loading configuration from "/etc/kubernetes/kubeadm-join.yaml"
could not interpret GroupVersionKind; unmarshal error: error converting YAML to JSON: yaml: invalid map key: map[interface {}]interface {}{"KUBE_LOG_LEVEL":interface {}(nil)}
+ [[ false == true ]]

it has to replace the log level always or it will not work

[aojea]

pushed a new version

[k8s-ci-robot]

@aojea: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-e2e-ec2-quick	360f145	link	true	/test pull-kubernetes-e2e-ec2-quick
pull-kubernetes-e2e-ec2-cloud-provider-quick	360f145	link	false	/test pull-kubernetes-e2e-ec2-cloud-provider-quick
pull-kubernetes-e2e-ec2-cloud-provider-canary	360f145	link	false	/test pull-kubernetes-e2e-ec2-cloud-provider-canary
pull-kubernetes-e2e-ec2-conformance-canary	360f145	link	true	/test pull-kubernetes-e2e-ec2-conformance-canary
pull-kubernetes-e2e-ec2-canary	360f145	link	true	/test pull-kubernetes-e2e-ec2-canary

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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