Add test case for ignored packages

Validate that packages imported in an ignored package are not
included in the manifest or lock.

Author: carolynvs

cmd/dep/testdata/harness_tests/ensure/empty/case3/README.md

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+Validate that packages imported in an ignored package are not
+included in the manifest or lock.

cmd/dep/testdata/harness_tests/ensure/empty/case3/final/Gopkg.lock

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+ignored = ["github.com/sdboyer/deptestdos"]
+
+[[dependencies]]
+  branch = "master"
+  name = "github.com/sdboyer/deptest"

cmd/dep/testdata/harness_tests/ensure/empty/case3/final/Gopkg.toml

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+ignored = ["github.com/sdboyer/deptestdos"]
+
+[[dependencies]]
+  branch = "master"
+  name = "github.com/sdboyer/deptest"

cmd/dep/testdata/harness_tests/ensure/empty/case3/initial/Gopkg.lock

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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 main
+
+import (
+	_ "github.com/sdboyer/deptest"
+)
+
+func main() {
+}

cmd/dep/testdata/harness_tests/ensure/empty/case3/initial/Gopkg.toml

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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 _ "github.com/sdboyer/deptestdos"

cmd/dep/testdata/harness_tests/ensure/empty/case3/initial/main.go

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+{
+  "commands": [
+    ["ensure"]
+  ],
+  "vendor-final": [
+    "github.com/sdboyer/deptest"
+  ]
+}