This commit extracts the information about the default for tables in keyspace creation to a separate file in the _common folder. The file is then included using the scylladb_include_flag directive. The purpose of this commit is to make it possible to include a different file in the scylla-enterprise repo - with a different default. Refs https://github.com/scylladb/scylla-enterprise/issues/4585 Closes scylladb/scylladb#20181