update vendor

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/opencontainers/image-spec/.tool/check-license

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ret=0
+
+for file in $(find . -type f -iname '*.go' ! -path './vendor/*'); do
+	if ! head -n3 "${file}" | grep -Eq "(Copyright|generated|GENERATED)"; then
+		echo "${file}:missing license header"
+		ret=1
+	fi
+done
+
+exit $ret

vendor/github.com/opencontainers/image-spec/.tool/genheader.go

@@ -0,0 +1,54 @@
+// Copyright 2017 The Linux Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"text/template"
+
+	specs "github.com/opencontainers/image-spec/specs-go"
+)
+
+var headerTemplate = template.Must(template.New("gen").Parse(`<title>image-spec {{.Version}}</title>
+<base href="https://raw.githubusercontent.com/opencontainers/image-spec/{{.Branch}}/">`))
+
+type Obj struct {
+	Version string
+	Branch  string
+}
+
+func main() {
+	obj := Obj{
+		Version: specs.Version,
+		Branch:  specs.Version,
+	}
+	if strings.HasSuffix(specs.Version, "-dev") {
+		cmd := exec.Command("git", "log", "-1", `--pretty=%H`, "HEAD")
+		var out bytes.Buffer
+		cmd.Stdout = &out
+		cmd.Stderr = os.Stderr
+		if err := cmd.Run(); err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+
+		obj.Branch = strings.Trim(out.String(), " \n\r")
+	}
+	headerTemplate.Execute(os.Stdout, obj)
+}

vendor/github.com/opencontainers/image-spec/.tool/lint

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+if [ ! $(command -v gometalinter) ]; then
+	go get -u github.com/alecthomas/gometalinter
+	gometalinter --install
+fi
+
+for d in $(find . -type d -not -iwholename '*.git*' -a -not -iname '.tool' -a -not -iwholename '*vendor*'); do
+	gometalinter \
+		--exclude='error return value not checked.*(Close|Log|Print).*\(errcheck\)$' \
+		--exclude='.*_test\.go:.*error return value not checked.*\(errcheck\)$' \
+		--exclude='duplicate of.*_test.go.*\(dupl\)$' \
+		--exclude='schema/fs.go' \
+		--disable=aligncheck \
+		--disable=gotype \
+		--disable=gas \
+		--cyclo-over=35 \
+		--tests \
+		--deadline=60s "${d}"
+done