parallel snstop

[awccopp]

Purpose

The purpose of this PR is to parallelize the SNSTOP user callback function.
See #417 for commit history.
A --timeout option has been added to the testflo arguments to avoid tests to hang.

Expected time until merged

1 month

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Tests were added to ensure other processors are calling the snstop function.

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Attention: Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.97%. Comparing base (f66e9fb) to head (e4fd7b1).

Files with missing lines	Patch %	Lines
pyoptsparse/pyOpt_optimizer.py	0.00%	5 Missing ⚠️
pyoptsparse/pySNOPT/pySNOPT.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #420       +/-   ##
===========================================
+ Coverage   74.98%   85.97%   +10.98%     
===========================================
  Files          22       22               
  Lines        3338     3358       +20     
===========================================
+ Hits         2503     2887      +384     
+ Misses        835      471      -364     

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