remove the temporary file to make the hyperkube image smaller

[foxyriver]

Remove the temporary file after apt-get install to make the hyperkube image smaller.

[k8s-ci-robot]

Hi @foxyriver. 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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[ixdy]

/assign @tallclair

[ixdy]

/ok-to-test

[tallclair]

/lgtm

[tallclair]

I'm curious, do you have any data on how much of a difference this makes?

[ixdy]

/approve no-issue
/release-note-none
/retest

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: foxyriver, ixdy, tallclair

Associated issue requirement bypassed by: ixdy

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[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 49805, 50052)