vendor: move to use containerd/btrfs

Signed-off-by: Stephen J Day <stephen.day@docker.com>

snapshot/btrfs/btrfs.go

@@ -9,13 +9,13 @@ import (
 	"path/filepath"
 
 	"github.com/Sirupsen/logrus"
+	"github.com/containerd/btrfs"
 	"github.com/containerd/containerd"
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/plugin"
 	"github.com/containerd/containerd/snapshot"
 	"github.com/containerd/containerd/snapshot/storage"
 	"github.com/pkg/errors"
-	"github.com/stevvooe/go-btrfs"
 )
 
 type btrfsConfig struct {

vendor.conf

@@ -16,7 +16,7 @@ github.com/golang/protobuf 8ee79997227bf9b34611aee7946ae64735e6fd93
 github.com/opencontainers/runc 50401b5b4c2e01e4f1372b73a021742deeaf4e2d
 github.com/opencontainers/runtime-spec 035da1dca3dfbb00d752eb58b0b158d6129f3776
 github.com/Sirupsen/logrus v0.11.0
-github.com/stevvooe/go-btrfs ea304655a3ed8f00773db1844f921d12541ee0d1
+github.com/containerd/btrfs e9c546f46bccffefe71a6bc137e4c21b5503cc18
 github.com/stretchr/testify v1.1.4
 github.com/davecgh/go-spew v1.1.0
 github.com/pmezard/go-difflib v1.0.0

vendor/github.com/containerd/btrfs/README.md

@@ -1,5 +1,5 @@
 # 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)
+[![GoDoc](https://godoc.org/github.com/containerd/btrfs?status.svg)](https://godoc.org/github.com/containerd/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.