cephfs: add read affinity mount option

This commit makes use of crush location labels from node
labels to supply `crush_location` and `read_from_replica=localize`
options during mount. Using these options, cephfs
will be able to redirect reads to the closest OSD,
improving performance.

Signed-off-by: Praveen M <m.praveen@ibm.com>

deploy/cephfs/kubernetes/csi-nodeplugin-rbac.yaml

@@ -10,6 +10,9 @@ apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: cephfs-csi-nodeplugin
 rules:
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["get"]
   - apiGroups: [""]
     resources: ["secrets"]
     verbs: ["get"]