The behaviour of the `include` module is badly defined (it try to choose
between statically importing the tasks and dynamically including them)
and can cause problems depending on any number of constraints (mostly if
it choose the wrong behaviour).
Replace it with the `import_tasks` (always statically import tasks) unless
the `include` is in a loop in which case we replace it with
`include_tasks` (always dynamically include tasks).
When including a specific tasks file, we bypass the "main" tasks of the role and the conditionals.
That way we don't play useless tasks and don't rely on default values.
Jérémy Lecour
Victor LABORIE