Apply black to pyomo/solvers 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/solvers && black -S -C .

Changes proposed in this PR:

• Apply black to the pyomo/solvers 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: 87.04% // Head: 87.00% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (72b2dbf) compared to base (c79e1e9).
Patch coverage: 64.35% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2732      +/-   ##
==========================================
- Coverage   87.04%   87.00%   -0.05%     
==========================================
  Files         771      771              
  Lines       86167    86626     +459     
==========================================
+ Hits        75004    75367     +363     
- Misses      11163    11259      +96     

Flag	Coverage Δ
linux	84.14% <49.09%> (+<0.01%)	⬆️
osx	73.61% <43.23%> (+0.02%)	⬆️
other	84.33% <49.18%> (+<0.01%)	⬆️
win	81.52% <49.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
pyomo/solvers/plugins/__init__.py	100.00% <ø> (ø)
pyomo/solvers/plugins/converter/ampl.py	30.23% <0.00%> (ø)
pyomo/solvers/plugins/converter/pico.py	31.81% <0.00%> (ø)
pyomo/solvers/plugins/solvers/XPRESS.py	70.00% <0.00%> (ø)
pyomo/solvers/wrappers.py	0.00% <ø> (ø)
pyomo/solvers/plugins/solvers/CONOPT.py	45.78% <17.64%> (ø)
pyomo/solvers/plugins/solvers/gurobi_persistent.py	68.71% <26.92%> (ø)
pyomo/solvers/plugins/solvers/cplex_persistent.py	52.72% <33.33%> (ø)
...ers/plugins/solvers/direct_or_persistent_solver.py	88.67% <35.29%> (ø)
pyomo/solvers/plugins/solvers/gurobi_direct.py	73.60% <37.28%> (ø)
... and 58 more

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