Remove Py27 compats and update imports for MagicMock and Patch

[rohitthakur2590]

SUMMARY

• remove compat files as we stopped testing against python 2.7.
• update direct imports for patch and MagicMock from unittest.

ISSUE TYPE

• Bugfix Pull Request
• Docs Pull Request
• Feature Pull Request
• New Module Pull Request

COMPONENT NAME

ADDITIONAL INFORMATION

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.08%. Comparing base (b6abed5) to head (3b23f22).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #522 +/- ## ========================================== + Coverage 82.76% 83.08% +0.32% ========================================== Files 153 151 -2 Lines 11967 11904 -63 ========================================== - Hits 9904 9890 -14 + Misses 2063 2014 -49 ```

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[softwarefactory-project-zuul[bot]]

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