Reorganize botocore tests

[jakob-keller]

Description of Change

• remove commented out code
• rename boto_tests to botocore_tests

Assumptions

tests/botocore_tests should be closely aligned with upstream

Checklist for All Submissions

• I have added change info to CHANGES.rst
• If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details):
  • Detailed description of issue
  • Alternative methods considered (if any)
  • How issue is being resolved
  • How issue can be reproduced
• If this is providing a new feature (can be provided via link to issue with these details):
  • Detailed description of new feature
  • Why needed
  • Alternatives methods considered (if any)

Checklist when updating botocore and/or aiohttp versions

• I have read and followed CONTRIBUTING.rst
• I have updated test_patches.py where/if appropriate (also check if no changes necessary)
• I have ensured that the awscli/boto3 versions match the updated botocore version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.72%. Comparing base (1a35466) to head (b2ae635).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1311      +/-   ##
==========================================
- Coverage   90.76%   90.72%   -0.05%     
==========================================
  Files          68       68              
  Lines        6542     6542              
==========================================
- Hits         5938     5935       -3     
- Misses        604      607       +3     

Flag	Coverage Δ
unittests	90.72% <100.00%> (-0.05%)	⬇️

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[jakob-keller]

@thehesiod: Sorry, I had to rebase the PR due to conflicts. Should be a quick review. Thank you!