add net info to "cluster-show" sub command

Registered by yanzhiwei

when we create two cluster with the same name , there will be two subnet associated with these clusters, but wei can't get the relationship of cluster and subnet, so we can add the subnet info to "cluster-show".

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Priority:
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Drafter:
yanzhiwei
Direction:
Needs approval
Assignee:
yanzhiwei
Definition:
New
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None
Implementation:
Unknown
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