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The test changes the servers' configuration to include `raft` in the `experimental-features` list, then restarts them. It waits until driver reconnects to every server after restarting. Then it checks that upgrade eventually finishes on every server by querying `group0_upgrade_state` key in `system.scylla_local`. Finally, it performs a schema change and verifies that a corresponding entry has appeared in `system.group0_history`. The commit also increases the number of clusters in the suite cluster pool. Since the suite contains only one test at this time this only has an effect if we run the test multiple times (using `--repeat`).