devel/py-pytest-drop-dup-tests: New Port

[agh_riseup.net]

Summary

devel/py-pytest-drop-dup-tests: A Pytest plugin to drop duplicated tests
during collection.

Pytest by default will collect all tests from directories or files given
in the command-line. Tests from tests/unit will appear twice, because
they will be collected again when pytest sees the tests directory in the
command-line.

This plugin is intended for the cases where the user wants to run all
tests from tests/unit first and then the rest of the tests under tests,
without duplicates.

https://github.com/nicoddemus/pytest-drop-dup-tests

[agh_riseup.net]

Move pytest from ${USES} to ${USE_PYTHON}