ETCD_674: Add a test suite for disruptive vertical scaling of etcd members

[jubittajohn]

This disruptive test suite covers unhappy-path etcd vertical scaling scenarios and is intended to run separately from the standard etcd scaling suite, which assumes stable cluster operation. Tests in this suite intentionally introduce control plane disruptions, such as stopping the kubelet to render etcd members unhealthy, in order to validate safe and correct scale-down and scale-up behavior. As a result, this suite is disruptive by design.

[openshift-ci-robot]

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[openshift-ci]

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This pull-request has been approved by: jubittajohn
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[openshift-ci]

@jubittajohn: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/okd-scos-images	aa88f71	link	true	/test okd-scos-images

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