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We want to move towards rack-list based replication factor for tablets being the default mode, and in the future the only supported mode. This PR is a step towards that. We auto-expand numeric RF to rack list on keyspace creation and ALTER when rf_rack_valid_keyspaces option is enabled. The PR is mostly about adjusting tests. The main logic change is in the last patch, which modifies option post-processing in ks_prop_defs. Fixes #26397 Closes scylladb/scylladb#26692 * github.com:scylladb/scylladb: cql3: ks_prop_defs: Expand numeric RF to rack list locator: Move rack_list to topology.hh alternator: Do not set RF for zero-token DCs alternator: Switch keyspace creation to use ks_prop_defs test: alternator: Adjust for rack lists cql3: Move validation of invalid ALTER KEYSPACE earlier, to ks_prop_defs test: cqlpy: Mark tests using rack lists as scylla-only test: Switch to rack-list based RF test: Generalize tests to work with both numeric RF and rack lists test: cluster: test_zero_token_nodes_multidc: Adjust to rack list RF test: Prepare for handling errors specific to rack list path test: cluster: dtest: alternator: Force RF=1 in test_putitem_contention test: Create cluster with multiple racks in multi-dc setups test: boost: network_topology_strategy_test: Adjust to rack-list RF test: tablets: Adjust to rack list test: cluster: test_group0_schema_versioning: Use smaller RF to respect rf-rack-validness test: tablets_test: Convert test_per_shard_goal_mixed_dc_rf to be rack-valid test: object_store: test_backup: Adjust for rack lists test: cluster: tablets: Do not move tablet across racks in test_tablet_transition_sanity test: cluster: mv: Do not move tablets across racks test: cluster: util: Fix docstring for parse_replication_options() tablets, topology_coordinator: Skip tablet draining on replace