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**What this PR does**:
It seems that the registryProtocol should be a singleton. The method
GetProtocol doesn't set the value after it creates an instance of
registryProtocol. So every time we invoke extension.GetProtocol("registry"), we
will get different instances.
But the registryProtocol mantains all the instances of Registry, it should be a
singleton.
**Which issue(s) this PR fixes**:
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Fixes #
**Special notes for your reviewer**:
**Does this PR introduce a user-facing change?**:
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[ Full content available at: https://github.com/apache/dubbo-go/pull/251 ]
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