Make sure to deactivate `conda`
Make sure to deactivate `conda`

When looping through the `conda` installs, make sure to deactivate each
one after we are done using that `conda` installation. Also drop `root`
from `activate` as `root` is already assumed if no environment name is
specified.

nanshe-org/docker_centos_drmaa_conda,jakirkham/docker_centos_drmaa_conda,DudLab/docker_centos_drmaa_conda