Change pytestconfig to request.config

[epassaro]

Description

Closes issue #1186.

Motivation and Context

See the issue description.

How Has This Been Tested?

All tests pass.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have assigned/requested two reviewers for this pull request.

[codecov]

Codecov Report

Merging #1190 into master will not change coverage.
The diff coverage is 55.55%.

@@           Coverage Diff           @@
##           master    #1190   +/-   ##
=======================================
  Coverage   77.71%   77.71%           
=======================================
  Files          91       91           
  Lines        5727     5727           
=======================================
  Hits         4451     4451           
  Misses       1276     1276           

Impacted Files	Coverage Δ
tardis/tests/integration_tests/test_integration.py	26.58% <0.00%> (ø)
tardis/montecarlo/tests/test_packet_source.py	86.36% <57.14%> (ø)
tardis/plasma/tests/test_complete_plasmas.py	97.77% <100.00%> (ø)

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[epassaro]

I don't know why Codecov is -2%, doesn't have sense.

[Rodot-]

This is odd, looks like something might be wrong with the changes to test_integration.py?

[epassaro]

I don't think so.

Seems codecov calculates the % of coverage by the length of the tests or something like that. Now our tests are exactly the same but shorter in number of lines or something.

Also I deleted a docstring by mistake, already fixed it.