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3ed3966f13
When we obtained a new cluster for a test case after the previous test case left a dirty cluster, we would release the old cluster's used IP addresses (`_before_test` function). However, we would not release the last cluster's IP after the last test case. We would run out of IPs with sufficiently many test files or `--repeat` runs. Fix this. Also reorder the operations a bit: stop the cluster (and release its IPs) before freeing up space in the cluster pool (i.e. call `self.cluster.stop()` before `self.clusters.steal()`). This reduces concurrency a bit - fewer Scyllas running at the same time, which is good (the pool size gives a limit on the desired max number of concurrently running clusters). Killing a cluster is quick so it won't make a significant difference for the next guy waiting on the pool. Closes #12564