Prioritize the use of auth login

[baoy1]

For 4.x and above, auth login is preferred.
The code change helps to avoid certain scenarios, e.g. when cluster is not ready, login API will failed.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.77%. Comparing base (bff17c6) to head (db84ca8).

Files with missing lines	Patch %	Lines
PyPowerFlex/base_client.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   95.57%   95.77%   +0.19%     
==========================================
  Files          67       67              
  Lines        4114     4116       +2     
==========================================
+ Hits         3932     3942      +10     
+ Misses        182      174       -8     

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