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b536614913
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
(cherry picked from commit 3ed3966f13)