e2e: add/modify deployment files for cephfs snapshot/clone tests

Add snapshot class, snapshot, restore, clone PVC and pod yamls
for e2e test to consume

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

examples/cephfs/pod-restore.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: csi-cephfs-restore-demo-pod
+spec:
+  containers:
+    - name: web-server
+      image: nginx
+      volumeMounts:
+        - name: mypvc
+          mountPath: /var/lib/www/html
+  volumes:
+    - name: mypvc
+      persistentVolumeClaim:
+        claimName: cephfs-pvc-restore
+        readOnly: false