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).
The comments used by ansible's blockinfile module break the format
expected by proftpd for public ssh keys, making them unusable.
Replace with a template, we will just have to accept that we need to use
ansible for all changes to these file.
* need documentation
* faster, easier, more robust and reliable than loop on
include_role with account.yml task
* account.yml task will be removed in future release
Ludovic Poujol
Jérémy Lecour
Victor LABORIE