Apply black to duality, mpec, and environ 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 pyomo/duality && black -S -C pyomo/mpec && black -S -C pyomo/environ

⚠️ Please squash this at merge. ⚠️

Changes proposed in this PR:

• Apply black to the duality, mpec, and environ directory py files
• Manually fix instances where two lines were merged and left " " or ' '

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

Patch coverage: 65.89% and project coverage change: -0.01 ⚠️

Comparison is base (b6af7b0) 87.01% compared to head (4be1436) 87.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2779      +/-   ##
==========================================
- Coverage   87.01%   87.00%   -0.01%     
==========================================
  Files         763      763              
  Lines       87123    87123              
==========================================
- Hits        75807    75805       -2     
- Misses      11316    11318       +2     

Flag	Coverage Δ
linux	84.01% <65.62%> (-0.01%)	⬇️
osx	73.51% <60.93%> (ø)
other	84.20% <65.62%> (ø)
win	81.52% <65.62%> (ø)

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

Impacted Files	Coverage Δ
pyomo/duality/lagrangian_dual.py	0.00% <0.00%> (ø)
pyomo/mpec/plugins/__init__.py	100.00% <ø> (ø)
pyomo/mpec/plugins/pathampl.py	100.00% <ø> (ø)
pyomo/duality/collect.py	57.52% <30.76%> (ø)
pyomo/duality/plugins.py	80.00% <61.53%> (ø)
pyomo/environ/__init__.py	82.35% <75.00%> (ø)
pyomo/mpec/plugins/mpec4.py	94.44% <87.50%> (ø)
pyomo/mpec/complementarity.py	95.90% <93.75%> (ø)
pyomo/mpec/plugins/mpec2.py	98.11% <94.11%> (ø)
pyomo/mpec/plugins/mpec1.py	100.00% <100.00%> (ø)
... and 3 more

... and 2 files with indirect coverage changes

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[mrmundt]

⚠️ Please squash this at merge. ⚠️