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Before the patch if a decommissioned node tries to restart, it calls _group0->discover_group0 first in join_cluster, which hangs since decommissioned nodes are banned and other nodes don't respond to their discovering requests. We fix the problem by checking was_decommissioned() flag before calling discover_group0. fixes scylladb/scylladb#17282 Closes scylladb/scylladb#17358