start: fixed the type value for kubectl version mismatch to warning

[vinu2003]

This PR addresses code changes that fix the value for type from "type":"io.k8s.sigs.minikube.error" to "type":"io.k8s.sigs.minikube.warning" for the kubectl version mismatch.

Before:

{"data":{"message":"/home/vinu/go_workspace/bin/kubectl is version 1.20.0-alpha.0.188+65a1f24b205ece-dirty, which may be incompatible with Kubernetes 1.19.0."},"datacontenttype":"application/json","id":"aa1a2e48-2cd6-4c31-818e-d408cd16894e","source":"https://minikube.sigs.k8s.io/","specversion":"1.0","type":"io.k8s.sigs.minikube.warning"}
{"data":{"message":"You can also use 'minikube kubectl -- get pods' to invoke a matching version"},"datacontenttype":"application/json","id":"9ee30007-ce04-4140-ad2f-7c0b65e4dab3","source":"https://minikube.sigs.k8s.io/","specversion":"1.0","type":"io.k8s.sigs.minikube.error"}

After:

{"data":{"message":"/home/vinu/go_workspace/bin/kubectl is version 1.20.0-alpha.0.188+65a1f24b205ece-dirty, which may be incompatible with Kubernetes 1.19.0."},"datacontenttype":"application/json","id":"fa37ebd3-f512-49e3-91b7-b68d7752847e","source":"https://minikube.sigs.k8s.io/","specversion":"1.0","type":"io.k8s.sigs.minikube.warning"}
{"data":{"message":"You can also use 'minikube kubectl -- get pods' to invoke a matching version"},"datacontenttype":"application/json","id":"a1ce4f17-7980-4cdd-84b7-00de4993110c","source":"https://minikube.sigs.k8s.io/","specversion":"1.0","type":"io.k8s.sigs.minikube.warning"}

[k8s-ci-robot]

Hi @vinu2003. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vinu2003
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[minikube-bot]

Can one of the admins verify this patch?

[vinu2003]

/cc @tstromberg

[tstromberg]

Thank you!