Add script to fix filename in junit output.

[brittonsmith]

PR Summary

This adds a simple script to modify the contents of the xml file produced by pytest on circleci so that the file entry reflects the test script and not the file of the base class. I hope this will allow the circleci parallelism to work a bit better.

PR Checklist

• [ ] Code passes tests.
• [ ] New features are documented with docstrings and narrative docs.
• [ ] Tests added for fixed bugs or new features.

[brittonsmith]

Now to figure out if it worked.