Windows: Updates Windows Vendoring

Updates windows dependent libraries for vendoing.

vendor/github.com/Microsoft/hcsshim/test/functional/utilities/defaultwindowsspec.go

@@ -0,0 +1,21 @@
+package testutilities
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"testing"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+func GetDefaultWindowsSpec(t *testing.T) *specs.Spec {
+	content, err := ioutil.ReadFile(`assets\defaultwindowsspec.json`)
+	if err != nil {
+		t.Fatalf("failed to read defaultwindowsspec.json: %s", err.Error())
+	}
+	spec := specs.Spec{}
+	if err := json.Unmarshal(content, &spec); err != nil {
+		t.Fatalf("failed to unmarshal contents of defaultwindowsspec.json: %s", err.Error())
+	}
+	return &spec
+}