arena get should display user

[happy2048]

arena get command should display user name,like:

arena get elastic-training

Name: elastic-training Status: SUCCEEDED Namespace: default Priority: N/A Trainer: ETJOB Duration: 10d Uid: xxxxxxxxxxxxx ConsoleUser: xxxxxxxxx

Instances: NAME STATUS AGE IS_CHIEF GPU(Requested) NODE

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elastic-training-launcher Completed 10d true 0 cn-beijing.192.168.9.10

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