Simon Willnauer a9169e536b Several internal improvements to internal test cluster infra (#26214)
This chance adds several random test infrastructure improvements that caused
issues in on-going developments but are generally useful. For instance is it impossible
to restart a node with a secure setting source since we close it after the node is started.
This change makes it cloneable such that we can reuse it for a restart.
2017-08-15 17:42:15 +02:00
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