Deprecate grpc metrics in ceph-csi

As kubernetes CSI sidecar is exposing the
GRPC mertics we can make use of the same in
ceph-csi we dont need to expose our own.

update: #881

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

deploy/cephfs/kubernetes/csi-cephfsplugin.yaml

@@ -63,9 +63,6 @@ spec:
             - "--v=5"
             - "--drivername=cephfs.csi.ceph.com"
             - "--metadatastorage=k8s_configmap"
-            - "--metricsport=8090"
-            - "--metricspath=/metrics"
-            - "--enablegrpcmetrics=false"
           env:
             - name: POD_IP
               valueFrom:
@@ -163,7 +160,7 @@ spec:
             medium: "Memory"
           }
 ---
-# This is a service to expose the liveness and grpc metrics
+# This is a service to expose the liveness metrics
 apiVersion: v1
 kind: Service
 metadata:
@@ -176,9 +173,5 @@ spec:
       port: 8080
       protocol: TCP
       targetPort: 8681
-    - name: grpc-metrics
-      port: 8090
-      protocol: TCP
-      targetPort: 8091
   selector:
     app: csi-cephfsplugin