It's a simple helper used during boot-time that can enjoy query-processor from sharded<system_keyspace> Closes #12587 * github.com:scylladb/scylladb: system_keyspace: De-static system_keyspace::increment_and_get_generation system_keyspace: Fix indentation after previous patch system_keyspace: Coroutinize system_keyspace::increment_and_get_generation