[ISSUE #631] Support Consuming from Slave

[maixiaohai]

What is the purpose of the change

issue #631

Brief changelog

1. Add slave node id retry
2. Add unit test

Verifying this change

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[codecov-io]

Codecov Report

Merging #632 (38ec9fb) into master (d6e66a2) will increase coverage by 0.52%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #632      +/-   ##
==========================================
+ Coverage   24.42%   24.95%   +0.52%     
==========================================
  Files          48       48              
  Lines        5207     5226      +19     
==========================================
+ Hits         1272     1304      +32     
+ Misses       3725     3710      -15     
- Partials      210      212       +2     

Impacted Files	Coverage Δ
internal/route.go	18.97% <100.00%> (+9.72%)	⬆️

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