CSI - API change for CSI volume source type

This commit tracks source code update to support the CSI volume source type additionn.

Kubernetes-commit: af0c2bda94a65807c9c7aaa2d59f07fb62b8eea6

Author: vladimirvivien

core/v1/types.go

@@ -448,6 +448,9 @@ type PersistentVolumeSource struct {
 	// More info: https://releases.k8s.io/HEAD/examples/volumes/storageos/README.md
 	// +optional
 	StorageOS *StorageOSPersistentVolumeSource `json:"storageos,omitempty" protobuf:"bytes,21,opt,name=storageos"`
+	// CSI represents storage that handled by an external CSI driver
+	// +optional
+	CSI *CSIPersistentVolumeSource `json:"csi,omitempty" protobuf:"bytes,22,opt,name=csi"`
 }
 
 const (
@@ -1621,6 +1624,23 @@ type LocalVolumeSource struct {
 	Path string `json:"path" protobuf:"bytes,1,opt,name=path"`
 }
 
+// Represents storage that is managed by an external CSI volume driver
+type CSIPersistentVolumeSource struct {
+	// Driver is the name of the driver to use for this volume.
+	// Required.
+	Driver string `json:"driver" protobuf:"bytes,1,opt,name=driver"`
+
+	// VolumeHandle is the unique volume name returned by the CSI volume
+	// plugin’s CreateVolume to refer to the volume on all subsequent calls.
+	// Required.
+	VolumeHandle string `json:"volumeHandle" protobuf:"bytes,2,opt,name=volumeHandle"`
+
+	// Optional: The value to pass to ControllerPublishVolumeRequest.
+	// Defaults to false (read/write).
+	// +optional
+	ReadOnly bool `json:"readOnly,omitempty" protobuf:"varint,3,opt,name=readOnly"`
+}
+
 // ContainerPort represents a network port in a single container.
 type ContainerPort struct {
 	// If specified, this must be an IANA_SVC_NAME and unique within the pod. Each