Mostly no functional changes here except in patch 3.
* 'gleb/cleanups' of github.com:scylladb/scylla-dev:
migration_manager: move migration manager verbs to the IDL
storage_proxy: remove unused function
storage_proxy: co-routinize handle_paxos_prepare
storage_proxy: co-routinise handle_paxos_prune
service: raft: no need to sync schema if the cluster is in raft topology mode
messaging_service: co-routinize messaging_service::stop_client
gossiper: rename apply_state_locally_without_listener_notification to apply_state_locally_in_shadow_round
9dc8926252