raft: add raft tables to `extra_durable_tables` list
raft: add raft tables to `extra_durable_tables` list

`system.raft`, `system.raft_snapshots` and `system.raft_config`
were missing from the `extra_durable_tables` list, so that
`set_wait_for_sync_to_commitlog(true)` was not enabled when
the tables were re-created via `create_table_from_mutations`.

Tests: unit(dev)

Signed-off-by: Pavel Solodovnikov <2cf5887fafb117b7ff3e29b9720a7305c3313494@scylladb.com>
Message-Id: <20220210073418.484843-1-2cf5887fafb117b7ff3e29b9720a7305c3313494@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla