read config from K8s when upgrade

[wuxs]

In what area(s)?

/area cli
cli 升级时，不指定配置文件会导致配置被重置为默认配置，可以读取k8s configmap中的值来作为配置，避免升级时配置被重置掉

/area core

/area api

Describe the feature

Release Note

RELEASE NOTE:

[tkeel-bot]

@wuxs: Thanks for your issues report.

I'm waiting for a tkeel member to confirm it.

Details

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