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**What this PR does**:

- add simplified attribute in registry config

**Special notes for your reviewer**:

Adding a simplified attribute in registry config is for:

- Firstly, there is a simplified attribute in [java 
version](http://dubbo.apache.org/en-us/docs/user/references/xml/dubbo-registry.html).

- Secondly, simplified provider urls can release the pressure of the registry. 
And we can move other parameters in provider ursl to metedata center and config 
center.

**Does this PR introduce a user-facing change?**:
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```release-note
NONE
```

[ Full content available at: https://github.com/apache/dubbo-go/pull/474 ]
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