Send sigkill to hyperkit if sigterm doesn't work

[josedonizetti]

Fixes #3851

[k8s-ci-robot]

Hi @josedonizetti. 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: josedonizetti
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[minikube-bot]

Can one of the admins verify this patch?

[medyagh]

oh thank you so much for this PR ! I had seen this issue myself a few times ! great contribution ! thank you

[medyagh]

just nit pick but how about using retry util in "k8s.io/minikube/pkg/util" ?

[medyagh]

@minikube-bot OK to test

[medyagh]

/retest this please