memkv: don't use base64 to encode value field of GetResult
memkv: don't use base64 to encode value field of GetResult

neverchanje/consensus-yaraft,neverchanje/consensus-yaraft,neverchanje/yaraft-wal,neverchanje/consensus-yaraft,neverchanje/yaraft-wal,neverchanje/yaraft-wal,neverchanje/consensus-yaraft