fix: get wrong node ip on k8s

[rugalcrimson]

What is the purpose of the change

#101
node.getStatus().getAddresses().get(0).getAddress() will retrun hostname on k8s

# kubectl get node node1 -o yaml|grep addresses -A 6|tail -7
  addresses:
  - address: node1
    type: Hostname
  - address: xxxxx
    type: ExternalIP
  - address: xxxxx
    type: InternalIP

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[Pandas886]

This is a Good Improvement !

[Pandas886]

Same code should be reused

[rugalcrimson]

redundancy code reused