Fix the feature that GetNamesrv

[guyinyou]

The issue tracker is ONLY used for the go client (feature request of RocketMQ need to follow RIP process). Keep in mind, please check whether there is an existing same report before your raise a new one.

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BUG REPORT

1. Please describe the issue you observed:

   • What did you do (The steps to reproduce)?

   • What did you expect to see?

   • What did you see instead?

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   • What is your client version?

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FEATURE REQUEST

1. Please describe the feature you are requesting.

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[ShannonDing]

close due to #805