Update containerd to v1.2.0.

Signed-off-by: Lantao Liu <lantaol@google.com>

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

@@ -0,0 +1,21 @@
+/*
+ * HCS API
+ *
+ * No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)
+ *
+ * API version: 2.1
+ * Generated by: Swagger Codegen (https://github.com/swagger-api/swagger-codegen.git)
+ */
+
+package hcsschema
+
+type Storage struct {
+
+	//  List of layers that describe the parent hierarchy for a container's  storage. These layers combined together, presented as a disposable  and/or committable working storage, are used by the container to  record all changes done to the parent layers.
+	Layers []Layer `json:"Layers,omitempty"`
+
+	//  Path that points to the scratch space of a container, where parent  layers are combined together to present a new disposable and/or committable  layer with the changes done during its runtime.
+	Path string `json:"Path,omitempty"`
+
+	QoS *StorageQoS `json:"QoS,omitempty"`
+}