supports rbd-nbd for Ceph rbd volume mounts. ([#58916](https://github.com/kubernetes/kubernetes/pull/58916), [@ianchakeres](https://github.com/ianchakeres))

* CSI now allows credentials to be specified on CreateVolume/DeleteVolume, ControllerPublishVolume/ControllerUnpublishVolume, and NodePublishVolume/NodeUnpublishVolume operations. Before this change all API calls had to fetch key/value stored in secret and use it to authenticate/authorize these operations. With this change API calls receive...

              }
            ],
            "description": "controllerPublishSecretRef is a reference to the secret object containing sensitive information to pass to the CSI driver to complete the CSI ControllerPublishVolume and ControllerUnpublishVolume calls. This field is optional, and may be empty if no secret is required. If the secret object contains more than one secret, all secrets are passed."
          },
          "driver": {

  map<string, string> volumeAttributes = 5;

  // controllerPublishSecretRef is a reference to the secret object containing
  // sensitive information to pass to the CSI driver to complete the CSI
  // ControllerPublishVolume and ControllerUnpublishVolume calls.
  // This field is optional, and may be empty if no secret is required. If the
  // secret object contains more than one secret, all secrets are passed.
  // +optional

	// +optional
	VolumeAttributes map[string]string

	// ControllerPublishSecretRef is a reference to the secret object containing
	// sensitive information to pass to the CSI driver to complete the CSI
	// ControllerPublishVolume and ControllerUnpublishVolume calls.
	// This field is optional, and may be empty if no secret is required. If the
	// secret object contains more than one secret, all secrets are passed.
	// +optional

	"controllerPublishSecretRef": "controllerPublishSecretRef is a reference to the secret object containing sensitive information to pass to the CSI driver to complete the CSI ControllerPublishVolume and ControllerUnpublishVolume calls. This field is optional, and may be empty if no secret is required. If the secret object contains more than one secret, all secrets are passed.",

  map<string, string> volumeAttributes = 5;

  // controllerPublishSecretRef is a reference to the secret object containing
  // sensitive information to pass to the CSI driver to complete the CSI
  // ControllerPublishVolume and ControllerUnpublishVolume calls.
  // This field is optional, and may be empty if no secret is required. If the
  // secret object contains more than one secret, all secrets are passed.
  // +optional

	// controllerPublishSecretRef is a reference to the secret object containing
	// sensitive information to pass to the CSI driver to complete the CSI
	// ControllerPublishVolume and ControllerUnpublishVolume calls.
	// This field is optional, and may be empty if no secret is required. If the
	// secret object contains more than one secret, all secrets are passed.
	// +optional

						SchemaProps: spec.SchemaProps{
							Description: "controllerPublishSecretRef is a reference to the secret object containing sensitive information to pass to the CSI driver to complete the CSI ControllerPublishVolume and ControllerUnpublishVolume calls. This field is optional, and may be empty if no secret is required. If the secret object contains more than one secret, all secrets are passed.",

          "description": "controllerPublishSecretRef is a reference to the secret object containing sensitive information to pass to the CSI driver to complete the CSI ControllerPublishVolume and ControllerUnpublishVolume calls. This field is optional, and may be empty if no secret is required. If the secret object contains more than one secret, all secrets are passed."
        },
        "driver": {

          "description": "controllerPublishSecretRef is a reference to the secret object containing sensitive information to pass to the CSI driver to complete the CSI ControllerPublishVolume and ControllerUnpublishVolume calls. This field is optional, and may be empty if no secret is required. If the secret object contains more than one secret, all secrets are passed."
        },
        "driver": {