Function raftstore::store::worker::pd::send_admin_request

fn send_admin_request<EK, ER>(
    router: &RaftRouter<EK, ER>, 
    region_id: u64, 
    epoch: RegionEpoch, 
    peer: Peer, 
    request: AdminRequest, 
    callback: Callback<EK::Snapshot>
) where
    EK: KvEngine,
    ER: RaftEngine,