ceph-container-common: modify requirement flow

ceph-container-common: modify requirement flow

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was outdated.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>
(cherry picked from commit 8105a1cefb065b8a519de0aad1c89c8c887ee2a4)