Apply black to the root 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: black -S -C *.py

Changes proposed in this PR:

• Apply black to the root directory py files

Legal Acknowledgement

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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: 87.04% // Head: 87.12% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (ce67d33) compared to base (9ee4235).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2718      +/-   ##
==========================================
+ Coverage   87.04%   87.12%   +0.07%     
==========================================
  Files         766      768       +2     
  Lines       86079    86811     +732     
==========================================
+ Hits        74929    75630     +701     
- Misses      11150    11181      +31     

Flag	Coverage Δ
linux	84.18% <ø> (-0.02%)	⬇️
osx	73.59% <ø> (-0.03%)	⬇️
other	84.37% <ø> (-0.02%)	⬇️
win	81.55% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
conftest.py	86.36% <100.00%> (ø)
pyomo/scripting/plugins/download.py	69.38% <0.00%> (-14.29%)	⬇️
pyomo/contrib/mindtpy/iterate.py	79.54% <0.00%> (-1.82%)	⬇️
pyomo/gdp/plugins/bigm.py	98.01% <0.00%> (-0.37%)	⬇️
pyomo/gdp/plugins/bigm_mixin.py	94.01% <0.00%> (ø)
pyomo/gdp/plugins/gdp_to_mip_transformation.py	99.14% <0.00%> (ø)
pyomo/contrib/gdpopt/util.py	94.82% <0.00%> (+0.06%)	⬆️
pyomo/gdp/plugins/hull.py	94.80% <0.00%> (+0.15%)	⬆️
pyomo/core/expr/visitor.py	93.40% <0.00%> (+0.15%)	⬆️
pyomo/gdp/util.py	92.37% <0.00%> (+0.81%)	⬆️
... and 1 more

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