Ignore pytest warning errors
Ignore pytest warning errors

Fix pytest warnings as per https://docs.pytest.org/en/latest/changelog.html#pytest-5-0-0-2019-06-28

Note that pytes 5.1 will cause this to break again, but the underlying
problem has been fixed in #859.

panoptes/POCS,panoptes/POCS,panoptes/POCS,panoptes/POCS