etcd tarball: remove existing tarball if etcd certs need to be regenerated

[vrutkovs]

Fix for https://bugzilla.redhat.com/show_bug.cgi?id=1565762#c7

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vrutkovs

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[vrutkovs]

/cherrypick openshift-ansible-3.7-fix

[openshift-cherrypick-robot]

@vrutkovs: once the present PR merges, I will cherry-pick it on top of openshift-ansible-3.7-fix in a new PR and assign it to you.

In response to this:

/cherrypick openshift-ansible-3.7-fix

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[openshift-ci-robot]

@vrutkovs: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/gcp	9033ca3	link	/test gcp
ci/openshift-jenkins/logging	9033ca3	link	/test logging
ci/openshift-jenkins/system-containers	9033ca3	link	/test system-containers
ci/openshift-jenkins/install	9033ca3	link	/test install

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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[michaelgugino]

/lgtm

[sdodson]

/lgtm
I think this would fix it.

[openshift-cherrypick-robot]

@vrutkovs: new pull request created: #8161

In response to this:

/cherrypick openshift-ansible-3.7-fix

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.