fix: gredis maxActive config and duplicate connection bug

[qinyuguang]

• maxActive没生效
• redis adapter初始化了两次

[codecov-commenter]

Codecov Report

Base: 79.98% // Head: 79.98% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (895abb5) compared to base (cbbfd85).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 895abb5 differs from pull request most recent head 09d107e. Consider uploading reports for the commit 09d107e to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2479   +/-   ##
=======================================
  Coverage   79.98%   79.98%           
=======================================
  Files         599      599           
  Lines       49785    49786    +1     
=======================================
+ Hits        39821    39822    +1     
  Misses       8007     8007           
  Partials     1957     1957           

Flag	Coverage Δ
go-1.15-386	80.00% <100.00%> (-0.05%)	⬇️
go-1.15-amd64	79.99% <100.00%> (-0.03%)	⬇️
go-1.16-386	80.01% <100.00%> (-0.02%)	⬇️
go-1.16-amd64	80.01% <100.00%> (+0.01%)	⬆️
go-1.17-386	80.01% <100.00%> (-0.01%)	⬇️
go-1.17-amd64	80.00% <100.00%> (-0.01%)	⬇️
go-1.18-386	79.96% <100.00%> (+0.04%)	⬆️
go-1.18-amd64	79.96% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
contrib/nosql/redis/redis.go	88.88% <100.00%> (+0.13%)	⬆️

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