Vendor opengcs and hcsshim

Signed-off-by: Darren Stahl <darst@microsoft.com>

vendor/github.com/Microsoft/opengcs/client/hotremovevhd.go

@@ -0,0 +1,34 @@
+// +build windows
+
+package client
+
+import (
+	"fmt"
+
+	"github.com/Microsoft/hcsshim"
+	"github.com/sirupsen/logrus"
+)
+
+// HotRemoveVhd hot-removes a VHD from a utility VM. This is used in the global one-utility-VM-
+// service-VM per host scenario.
+func (config *Config) HotRemoveVhd(hostPath string) error {
+	logrus.Debugf("opengcs: HotRemoveVhd: %s", hostPath)
+
+	if config.Uvm == nil {
+		return fmt.Errorf("cannot hot-add VHD as no utility VM is in configuration")
+	}
+
+	modification := &hcsshim.ResourceModificationRequestResponse{
+		Resource: "MappedVirtualDisk",
+		Data: hcsshim.MappedVirtualDisk{
+			HostPath:          hostPath,
+			CreateInUtilityVM: true,
+		},
+		Request: "Remove",
+	}
+	if err := config.Uvm.Modify(modification); err != nil {
+		return fmt.Errorf("failed modifying utility VM for hot-remove %s: %s", hostPath, err)
+	}
+	logrus.Debugf("opengcs: HotRemoveVhd: %s removed successfully", hostPath)
+	return nil
+}