SG-29997 first phase python2 dropping

[eduardoChaucaGallegos]

• first phase python2 dropping

[codecov]

Codecov Report

Attention: Patch coverage is 73.78641% with 27 lines in your changes missing coverage. Please review.

Project coverage is 79.80%. Comparing base (43814ac) to head (1d7584d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
python/tank/authentication/user_impl.py	66.66%	3 Missing ⚠️
python/tank/util/shotgun/publish_creation.py	57.14%	3 Missing ⚠️
python/tank/authentication/login_dialog.py	66.66%	2 Missing ⚠️
python/tank/descriptor/io_descriptor/factory.py	75.00%	2 Missing ⚠️
python/tank/descriptor/io_descriptor/git_branch.py	66.66%	2 Missing ⚠️
python/tank/descriptor/io_descriptor/git_tag.py	66.66%	2 Missing ⚠️
python/tank/pipelineconfig_factory.py	71.42%	2 Missing ⚠️
python/tank/templatekey.py	91.66%	2 Missing ⚠️
python/tank/util/metrics.py	71.42%	2 Missing ⚠️
python/tank/util/pickle.py	80.00%	2 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #986      +/-   ##
==========================================
- Coverage   79.87%   79.80%   -0.08%     
==========================================
  Files         198      198              
  Lines       20719    20758      +39     
==========================================
+ Hits        16550    16565      +15     
- Misses       4169     4193      +24     

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[carlos-villavicencio-adsk]

This change should be done in python-api repo. Best candidate is shotgunsoftware/python-api#345

We can't manually update anything here under python/tank_vender/shotgun_api3.