[GitHub] [dubbo-go] hxmhlt opened pull request #167: Mod:remve zk jar file for unit test

["hxmhlt (GitHub)" <gi...@apache.org>]

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**What this PR does**:
Remve zk jar file for unit test, and modify .travis.yml file to download zk jar before execute unit test.

**Which issue(s) this PR fixes**:
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**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/167 ]
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