fix(zookeeper-registry): Support the options of WithoutKeepAlive for zookeeper(#86)

[s5364733]

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[felix021]

This option may be dangerous: if it's set to false and accidentally deployed to online env, it may cause unexpected error.

This is not a good way to solve the original problem. A better approach would be to distinguish your local machine and testing/product env, and do not register into zk if it's not testing/product env.

[DMwangnima]

Development specification issues shouldn't be left to frameworks. I would close this PR and related issue.