Smoketester now randomizes port used for tests #4055
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This PR makes the smoke tester use a random port instead of relying on hardcoded port 8983.
The benefit is that smoke tester is more resilient both on developer machine during release, where there can often be a Solr running on 8983, and in Jenkins, where you share host with many other jobs, even other Solr jobs.
This patch will
readSolrOutput(),is_port_in_use(),removeTrailingZeros()and the preemptive stop of solr on port 8983