[foxy] Install dependencies with apt instead of pip where possible #590
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pytest-cov and flake8 have the same versions in Ubuntu Focal as if they were installed with pip.
For setuptools, the version in Focal is 45.2.0. The previous version in Bionic is 39.0.1 and the version we get from pip is 46.1.1. Although the version from pip is newer, it doesn't look like we are effected by any changes.