Apply black to pyomo/checker directory py files

[mrmundt]

Fixes (Partly) #329

Summary/Motivation:

This is the first in a relatively long string of PRs to apply PEP8 standards via black to Pyomo. We are following the standard used by IDAES except that we are adding the -S option: Don't normalize string quotes or prefixes and the -C option: Don't use trailing commas as a reason to split lines.

NOTE: All changes are NFC.

Full command used: cd pyomo/checker && black -S -C .

Changes proposed in this PR:

• Apply black to the pyomo/checker directory py files

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Base: 87.03% // Head: 87.06% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (3acc0f4) compared to base (8fe21bb).
Patch coverage: 50.87% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2731      +/-   ##
==========================================
+ Coverage   87.03%   87.06%   +0.03%     
==========================================
  Files         771      771              
  Lines       86162    87570    +1408     
==========================================
+ Hits        74993    76246    +1253     
- Misses      11169    11324     +155     

Flag	Coverage Δ
linux	84.14% <61.70%> (-0.01%)	⬇️
osx	73.59% <61.70%> (+<0.01%)	⬆️
other	84.32% <61.70%> (+<0.01%)	⬆️
win	81.51% <55.31%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyomo/checker/plugins/__init__.py	100.00% <ø> (ø)
pyomo/checker/plugins/function.py	81.48% <0.00%> (ø)
pyomo/checker/plugins/checkers/model/assignment.py	54.28% <25.00%> (ø)
pyomo/checker/plugins/checkers/model/rule.py	45.45% <26.31%> (ø)
...yomo/checker/plugins/checkers/model/conditional.py	32.72% <42.85%> (ø)
pyomo/checker/plugins/checker.py	61.79% <50.00%> (ø)
pyomo/checker/plugins/checkers/model/model.py	78.00% <50.00%> (ø)
pyomo/checker/plugins/checkers/py3k/printing.py	85.71% <50.00%> (ø)
pyomo/checker/plugins/checkers/sample/printing.py	62.50% <50.00%> (ø)
pyomo/checker/checker.py	100.00% <100.00%> (ø)
... and 103 more

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