Can't find the key-values in tikv when using this tool to import data

[liujp]

when using this tool to import tiki-server, the kvs can not be found by GetKey();

client is a grpc client implemented using https://github.com/pingcap/kvproto/blob/ecdbf1f8c130089392a9bb5f86f7577deddfbed5/proto/import_kvpb.proto