Function raftstore::router::send_command_impl

fn send_command_impl<EK, PR>(
    router: &PR, 
    req: RaftCmdRequest, 
    cb: Callback<EK::Snapshot>, 
    deadline: Option<Deadline>
) -> RaftStoreResult<()> where
    EK: KvEngine,
    PR: ProposalRouter<EK::Snapshot>,