By default, if the file exists locally, get_url will NOT download the
file.
force shall be set to true to force the file to be downloaded.

1. Artifactory hosts a mirror of:
- conda-forge
- anaconda-main (this is the only channel from defaults that we care
  about)

We also add the ics-conda channel.
We probably want to allow people to add extra channels in the future.

2. Remove the user condarc file. The default configuration should be
   done at system level.

We want to track the changes to the conda environment files.
They should be in git instead of artifactory.

Use a handler to create the environment

Installer NOT updated to 4.4.10 due to this bug:
https://github.com/conda/conda/issues/7109

Have to wait for a newer installer before to update.
The installer doesn't really matter as long as we can update conda to
the version we want.

Use include_tasks instead of include (requires Ansible 2.4)

The conda env create command (with become) fails when
/home/conda/.conda/environments.txt doesn't exist.

See https://github.com/conda/conda/issues/6576

- update Miniconda installer (required to install conda 4.4)
- pin conda package to defaults channel to avoid downgrade with
  conda-forge channel
- use new /opt/conda/etc/profile.d/conda.sh profile script (remove old
  conda_env.sh)

Note that conda base environment is not activated.

The wheel version that was used was removed (broken package?)

environment files shall be passed via the conda_env_files variable.

Miniconda2 was made the default because of Ansible, but there is no
reason.
Ansible has to use the default Python installation in the first place.

For molecule, there is no problem to install that in a conda env with
Python2.

A new miniconda installer is not released with every conda version.
`conda_version` is now independant of `miniconda_version`.

Add tests on conda user

Ansible still requires Python 2.
We make Miniconda2 the default.

It's still possible to install Miniconda3 by overriding
miniconda_version and miniconda_installer_md5.

sudo is required to install conda.
It's automatically installed by molecule so the missing dependency was
not detected by molecule test.