deploy: add CSIDriver for NFS

The API is extended for generation of the NFS CSIDriver object. The
YAML file under deploy/ was created by `yamlgen`.

The contents of the csidriver.yaml file is heavily based on the upstream
CSIDriver from the Kubernetes csi-driver-nfs project.

Because ./tools/yamlgen uses the API, it gets copied under vendor/ .
This causes two copies of the API to be included in the repository, but
that can not be prevented, it seems.

See-also: https://github.com/kubernetes-csi/csi-driver-nfs/blob/master/deploy/csi-nfs-driverinfo.yaml
Signed-off-by: Niels de Vos <ndevos@redhat.com>

deploy/nfs/kubernetes/csidriver.yaml

@@ -0,0 +1,16 @@
+#
+# /!\ DO NOT MODIFY THIS FILE
+#
+# This file has been automatically generated by Ceph-CSI yamlgen.
+# The source for the contents can be found in the api/deploy directory, make
+# your modifications there.
+#
+---
+apiVersion: storage.k8s.io/v1
+kind: CSIDriver
+metadata:
+  name: "nfs.csi.ceph.com"
+spec:
+  attachRequired: false
+  volumeLifecycleModes:
+    - Persistent