Until now it was not possible to install a specific container package
because it was somehow hardcoded.
This patch allows to override the container package name (docker.io
vs docker-ce) and refacts the package installation. This could be
achieve via the container_package_name variable.
Instead of using one task per distribution we can set the package and
service name in vars. This allows to have a unified package task.
Also refactorize the debian_prerequisites tasks because the content
was outdated.
https://docs.docker.com/install/linux/docker-ce/debian/https://docs.docker.com/install/linux/docker-ce/ubuntu/Resolves: #3609
Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>