Need to support monitoring pods that mount ephemeral volumes

[alexzhc]

Currently, CSM does not monitor pods that mount ephemeral volumes.

For example:

spec:
     volumes:
      - name: data
        ephemeral:
          volumeClaimTemplate:
            metadata:
              labels:
                app: mysql
            spec:
              accessModes: 
              - ReadWriteMany
              storageClassName: dorado-nfs
              resources:
                requests:
                  storage: 2Gi

Dorado UI shows no pods for such a volume. Besides, /var/log/huawei-csm/csm-storage-service/cmi-service log does not have REST API POST calls for the pods.