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bb822c92ab
Most RAFT packets are sent very rarely during special phases of the protocol (like election or leader stepdown). The protocol itself does not care if a packet is sent or dropped, so returning futures from their send function does not serve any purpose. Change the raft's rpc interface to return void for all packet types but append_request. We still want to get a future from sending append_request for backpressure purposes since replication protocol is more efficient if there is no packet loss, so it is better to pause a sender than dropping packets inside the rpc. Rpc is still allowed to drop append_requests if overloaded.