kafka/server: map_topic_error_code map no_leader_controller

Instead of returning `unknown_server_error`, return `not_controller`

This is a retriable error code, with metadata refresh.

Fixes redpanda-data#2406

Signed-off-by: Ben Pope <ben@vectorized.io>

src/v/kafka/server/errors.h

@@ -27,6 +27,7 @@ constexpr error_code map_topic_error_code(cluster::errc code) {
     case cluster::errc::notification_wait_timeout:
         return error_code::request_timed_out;
     case cluster::errc::not_leader_controller:
+    case cluster::errc::no_leader_controller:
         return error_code::not_controller;
     case cluster::errc::topic_already_exists:
         return error_code::topic_already_exists;