Update hcsshim tag to v0.10.0-rc.9

Signed-off-by: Kirtana Ashok <kiashok@microsoft.com>

vendor/github.com/vishvananda/netns/nshandle_linux.go

@@ -0,0 +1,73 @@
+package netns
+
+import (
+	"fmt"
+
+	"golang.org/x/sys/unix"
+)
+
+// NsHandle is a handle to a network namespace. It can be cast directly
+// to an int and used as a file descriptor.
+type NsHandle int
+
+// Equal determines if two network handles refer to the same network
+// namespace. This is done by comparing the device and inode that the
+// file descriptors point to.
+func (ns NsHandle) Equal(other NsHandle) bool {
+	if ns == other {
+		return true
+	}
+	var s1, s2 unix.Stat_t
+	if err := unix.Fstat(int(ns), &s1); err != nil {
+		return false
+	}
+	if err := unix.Fstat(int(other), &s2); err != nil {
+		return false
+	}
+	return (s1.Dev == s2.Dev) && (s1.Ino == s2.Ino)
+}
+
+// String shows the file descriptor number and its dev and inode.
+func (ns NsHandle) String() string {
+	if ns == -1 {
+		return "NS(none)"
+	}
+	var s unix.Stat_t
+	if err := unix.Fstat(int(ns), &s); err != nil {
+		return fmt.Sprintf("NS(%d: unknown)", ns)
+	}
+	return fmt.Sprintf("NS(%d: %d, %d)", ns, s.Dev, s.Ino)
+}
+
+// UniqueId returns a string which uniquely identifies the namespace
+// associated with the network handle.
+func (ns NsHandle) UniqueId() string {
+	if ns == -1 {
+		return "NS(none)"
+	}
+	var s unix.Stat_t
+	if err := unix.Fstat(int(ns), &s); err != nil {
+		return "NS(unknown)"
+	}
+	return fmt.Sprintf("NS(%d:%d)", s.Dev, s.Ino)
+}
+
+// IsOpen returns true if Close() has not been called.
+func (ns NsHandle) IsOpen() bool {
+	return ns != -1
+}
+
+// Close closes the NsHandle and resets its file descriptor to -1.
+// It is not safe to use an NsHandle after Close() is called.
+func (ns *NsHandle) Close() error {
+	if err := unix.Close(int(*ns)); err != nil {
+		return err
+	}
+	*ns = -1
+	return nil
+}
+
+// None gets an empty (closed) NsHandle.
+func None() NsHandle {
+	return NsHandle(-1)
+}