rename socket directory to a common name

as the socket directory will be created
inside the container no need to follow
the plugin name in for the directory
creation, this will also reduce the code
changes if we want to change driver name.

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

deploy/cephfs/kubernetes/csi-cephfsplugin.yaml

@@ -65,11 +65,11 @@ spec:
                 fieldRef:
                   fieldPath: metadata.namespace
             - name: CSI_ENDPOINT
-              value: unix://var/lib/kubelet/plugins/cephfs.csi.ceph.com/csi.sock
+              value: unix:///csi/csi.sock
           imagePullPolicy: "IfNotPresent"
           volumeMounts:
             - name: plugin-dir
-              mountPath: /var/lib/kubelet/plugins/cephfs.csi.ceph.com
+              mountPath: /csi
             - name: csi-plugins-dir
               mountPath: /var/lib/kubelet/plugins/kubernetes.io/csi
               mountPropagation: "Bidirectional"