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Python tests requires different handling of metrics gathering from cgroup than C++ tests. pytest do not execute each python tests in a separate process, so we can't put it there and get the metrics. The idea is to put the whole pytest process to the cgroup and get the metrics. This will work because pytest runs the threads as as completely separate processes and inside the thread it will run tests consequently. Additionally, to simplify system resource monitor moved to pytest main thread.
Extension of the cluster tests, where all tests require externally mounted volumes to be used by scylla cluster nodes. The volumes are passed with --workdir.
The volumes can be of any size. A help generator space_limited_servers is provided
to easily create a cluster of any given number of nodes, where each node operates in
a separate volume.