No Python 3 / Python 2 test run twice

[jakirkham]

Appears instead of running the Python 3 tests, the Docker container build is running the Python 2 test twice as can be seen by this build. However, the same is not true when running the workflow tests the exact same way as can be seen in this build. Will need to look more closely to understand what is going wrong.

[jakirkham]

Should add this is now just Python 3 instead of Python 2. Switch came about when making Python 3 the new default with PR ( jakirkham/docker_centos_drmaa_conda#38 ). Activating the conda environments relevant for the tests has not helped. Not sure what the issue is, but the workflow CI (outside the container) does not have this issue. Probably worth closer inspection.