Use pip's built-in --log command to provide logging, as sometimes abrupt process exits don't drop logs (note: known issue with this version of pip will cause a stack trace when pip fails, but log file will be written https://github.com/pypa/pip/issues/219)
Merge pull request #212 from mortardata/ddaniels_pip_logs

[#73161968] Use pip's built-in --log command to provide logging