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e44820ba1f
In the following patches, we'll start allowing forwarding requests to strongly consistent tables so that they'll get executed on the suitable tablet Raft group members. For that we'll reuse the approach that we already have for bouncing requests to other shards - we'll try to execute a request locally, and the result of that will be a bounce message with another replica as the target. In this patch we generalize the former bounce_to_shard result message so that it will be able to specify the target of the bounce as another shard or specific replica. We also rename it to result_message::bounce so that it stops implying that only another shard may be its target. Aside from the host_id and the shard, the new message also includes the timeout, because in the service handling the forwarding we won't have the access to it, and it's needed for specifying how long we should wait for the forwarded requests. It also includes an information whether this is a write request to return correct timeout response in case the deadline is exceeded. We will return other hosts in the new bounce message when executing requests to strongly consistent tables when we can't handle the request because we aren't a suitable replica. We can't handle this message yet, so we don't return it anywhere and we still assume that every bounce message is a bounce to the same host.