ysqi cd31c816cc Config support get environment variable ...

get environment variable if config item  has prefix "$ENV_" .
e.g.
```ini
[demo]
password = $ENV_MyPWD
```

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..

xml

Config support get environment variable

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yaml

Config support get environment variable

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config.go

Config support get environment variable

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fake.go

Config support get environment variable

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ini_test.go

Config support get environment variable

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ini.go

Config support get environment variable

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json_test.go

Config support get environment variable

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json.go

Config support get environment variable

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