why not support all appollo settings in app.properties?such as `cluster` and `env`

[Jxiu]

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[nobodyiam]

see #3414 #3427

[Jxiu]

did you see that there is no full file (in only one file)support config in apollo system. @nobodyiam

[nobodyiam]

Though not recommended, the spring boot application.properties could config all the configs.

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