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Currently `cql_test_env` runs its `func` in the default (main) group and also leaves all scheduling groups in `dbcfg` default initialized to the same scheduling group. This results in every part of the system, normally isolated from each other, running in the same (default) scheduling group. Not a big problem on its own, as we are talking about tests, but this creates an artificial difference between the test and the real environment, which is ever more pronounced since certain query parameters are selected based on the current scheduling group. To bring cql test env just that little bit closer to the real thing, this patch creates all the scheduling groups main does (well almost) and configures `dbcfg` with them. Creating and destroying the scheduling group on each setup-teardown of cql test env breaks some internal seastar components which don't like seeing the same scheduling group with the same name but different id. So create the scheduling groups once on first access and keep them around until the test executable is running. Signed-off-by: Botond Dénes <bdenes@scylladb.com> Message-Id: <20210514141614.128213-2-bdenes@scylladb.com>