clean up unused nats code

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

vendor/github.com/stevvooe/continuity/README.md

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+# continuity
+
+A transport-agnostic, filesystem metadata manifest system
+
+This project is a staging area for experiments in providing transport agnostic
+metadata storage.
+
+Please see https://github.com/opencontainers/specs/issues/11 for more details.
+
+## Building Proto Package
+
+If you change the proto file you will need to rebuild the generated Go with `go generate`.
+
+```
+go generate ./proto
+```

vendor/github.com/stevvooe/go-btrfs/README.md

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+# go-btrfs
+[![GoDoc](https://godoc.org/github.com/stevvooe/go-btrfs?status.svg)](https://godoc.org/github.com/stevvooe/go-btrfs) [![Build Status](https://travis-ci.org/stevvooe/go-btrfs.svg?branch=master)](https://travis-ci.org/stevvooe/go-btrfs)
+
+Native Go bindings for btrfs.
+
+# Status
+
+These are in the early stages. We will try to maintain stability, but please
+vendor if you are relying on these directly.
+
+# Contribute
+
+This package may not cover all the use cases for btrfs. If something you need
+is missing, please don't hesitate to submit a PR.
+
+Note that due to struct alignment issues, this isn't yet fully native.
+Preferrably, this could be resolved, so contributions in this direction are
+greatly appreciated.