Update hcsshim to include DSR features

vendor/github.com/Microsoft/hcsshim/internal/schema2/plan9_share.go

@@ -20,6 +20,13 @@ type Plan9Share struct {
 
 	Port int32 `json:"Port,omitempty"`
 
+	// Flags are marked private. Until they are exported correctly
+	//
+	// ReadOnly      0x00000001
+	// LinuxMetadata 0x00000004
+	// CaseSensitive 0x00000008
+	Flags int32 `json:"Flags,omitempty"`
+
 	ReadOnly bool `json:"ReadOnly,omitempty"`
 
 	UseShareRootIdentity bool `json:"UseShareRootIdentity,omitempty"`