update vendor

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/Microsoft/hcsshim/internal/uvm/counter.go

@@ -0,0 +1,17 @@
+package uvm
+
+import "sync"
+
+var (
+	m       sync.Mutex
+	counter uint64
+)
+
+// ContainerCounter is used for where we layout things for a container in
+// a utility VM. For WCOW it'll be C:\c\N\. For LCOW it'll be /run/gcs/c/N/.
+func (uvm *UtilityVM) ContainerCounter() uint64 {
+	m.Lock()
+	defer m.Unlock()
+	counter++
+	return counter
+}