Imports
- github.com/golang/protobuf/proto
- github.com/hashicorp/vault/helper/errutil
- github.com/hashicorp/vault/logical
- golang.org/x/net/context
- google.golang.org/grpc
- github.com/golang/protobuf/ptypes
- github.com/hashicorp/vault/helper/wrapping
- github.com/golang/protobuf/ptypes/timestamp