Remove verbose logging from cluster initializers

[joni-]

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Description of change

We are using ClusterPipeline and noticed that our logs are filled with "Creating new instance of ClusterPipeline" entries. I am not sure if these entries provide much value so I thought we could either remove them completely or change the log level to debug.

Another thing that we noticed was that cluster.py is the only module that's doing any kind of logging at all.

[codecov-commenter]

Codecov Report

Merging #2055 (eaeaf80) into master (878e2f2) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2055      +/-   ##
==========================================
- Coverage   91.19%   91.19%   -0.01%     
==========================================
  Files         100      100              
  Lines       21248    21245       -3     
==========================================
- Hits        19378    19375       -3     
  Misses       1870     1870              

Impacted Files	Coverage Δ
redis/cluster.py	91.79% <ø> (-0.03%)	⬇️

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[chayim]

@joni- Thanks for helping clean this up! This definitely belongs in the 4.2.0 release. Much obliged.