Add first integration test case

Author: Brendan Munro

cmd/dep/testdata/harness_tests/init/govendor/case1/README.md

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+Import govendor config in vendor dir.

cmd/dep/testdata/harness_tests/init/govendor/case1/final/Gopkg.lock

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+ignored = ["github.com/sdboyer/dep-test","github.com/golang/notexist/samples"]
+
+[[constraint]]
+  name = "github.com/sdboyer/deptestdos"
+  version = "2.0.0"

cmd/dep/testdata/harness_tests/init/govendor/case1/final/Gopkg.toml

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+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/sdboyer/deptestdos"
+)
+
+func main() {
+	var x deptestdos.Bar
+	fmt.Println(x)
+}

cmd/dep/testdata/harness_tests/init/govendor/case1/initial/main.go

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+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package samples
+
+import dt "github.com/carolynvs/go-dep-test"
+
+func Sample1() int {
+	var x = dt.Thing
+	return x
+}

cmd/dep/testdata/harness_tests/init/govendor/case1/initial/samples/samples.go

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+{
+	"comment": "",
+	"ignore": "test github.com/sdboyer/dep-test",
+	"package": [
+		{
+			"checksumSHA1": "4R6TQcq0/gI/I2kKeUunuO/pEec=",
+			"origin": "github.com/carolynvs/deptest",
+			"path": "github.com/sdboyer/deptest",
+			"revision": "3f4c3bea144e112a69bbe5d8d01c1b09a544253f",
+			"revisionTime": "2017-02-22T03:31:47Z"
+		},
+		{
+			"checksumSHA1": "96YwrJjpE07ENey/eDWWnCWKQOw=",
+			"path": "github.com/sdboyer/deptestdos",
+			"revision": "5c607206be5decd28e6263ffffdcee067266015e",
+			"revisionTime": "2017-02-22T03:34:58Z",
+			"version": "v2",
+			"versionExact": "v2.0.0"
+		}
+	],
+	"rootPath": "github.com/golang/notexist"
+}

cmd/dep/testdata/harness_tests/init/govendor/case1/initial/vendor/vendor.json

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+{
+  "commands": [
+    ["init", "-no-examples", "-gopath"]
+  ],
+  "error-expected": "",
+  "gopath-initial": {
+    "github.com/sdboyer/deptest": "3f4c3bea144e112a69bbe5d8d01c1b09a544253f",
+    "github.com/sdboyer/deptestdos": "5c607206be5decd28e6263ffffdcee067266015e"
+  },
+  "vendor-final": [
+    "github.com/sdboyer/deptest",
+    "github.com/sdboyer/deptestdos"
+  ]
+}