Revendor github.com/Microsoft/hcsshim

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_create-scratch.go

@@ -0,0 +1,10 @@
+package runhcs
+
+import (
+	"context"
+)
+
+// CreateScratch creates a scratch vhdx at 'destpath' that is ext4 formatted.
+func (r *Runhcs) CreateScratch(context context.Context, destpath string) error {
+	return r.runOrError(r.command(context, "create-scratch", "--destpath", destpath))
+}