Windows: Updates Windows Vendoring

Updates windows dependent libraries for vendoing.

vendor/github.com/Microsoft/hcsshim/cmd/runhcs/spec.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/urfave/cli"
+)
+
+// loadSpec loads the specification from the provided path.
+func loadSpec(cPath string) (spec *specs.Spec, err error) {
+	cf, err := os.Open(cPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, fmt.Errorf("JSON specification file %s not found", cPath)
+		}
+		return nil, err
+	}
+	defer cf.Close()
+
+	if err = json.NewDecoder(cf).Decode(&spec); err != nil {
+		return nil, err
+	}
+	return spec, nil
+}
+
+// setupSpec performs initial setup based on the cli.Context for the container
+func setupSpec(context *cli.Context) (*specs.Spec, error) {
+	bundle := context.String("bundle")
+	if bundle != "" {
+		if err := os.Chdir(bundle); err != nil {
+			return nil, err
+		}
+	}
+	spec, err := loadSpec(specConfig)
+	if err != nil {
+		return nil, err
+	}
+	return spec, nil
+}