🐛 Cleanup if envtest controlplane fails to start

[ficoos]

Currently if the api server fails to start etcd process will be up
the next time ControlPlane.Start() is called, they will both have the
same listening address which will make the new etcd instance fail to
start.

The controlplane object will also be in an incomplete state
so calling ControlPlane.Close() will panic.

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[k8s-ci-robot]

Hi @ficoos. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[FillZpp]

/ok-to-test

Please complete the CLA auth.

[ficoos]

I've signed the CLA a while ago, how long does it take for the CLA bot to get updated?

[FillZpp]

I've signed the CLA a while ago, how long does it take for the CLA bot to get updated?

7. My pull request still doesn't pass!
   If you haven't yet, post a comment ("I signed it") to the PR—this is needed for the system to recheck your contribution authorization.

According to cla/linuxfoundation

[ficoos]

I signed it

[ficoos]

I signed it

[FillZpp]

/retest

[FillZpp]

/lgtm

PTAL @alvaroaleman @vincepri

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, ficoos

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