Windows: Updates Windows Vendoring

Updates windows dependent libraries for vendoing.

vendor/github.com/Microsoft/hcsshim/hnsendpoint.go

@@ -7,6 +7,9 @@ import (
 // HNSEndpoint represents a network endpoint in HNS
 type HNSEndpoint = hns.HNSEndpoint
 
+// Namespace represents a Compartment.
+type Namespace = hns.Namespace
+
 //SystemType represents the type of the system on which actions are done
 type SystemType string