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).
Nginx is already started at the end of the main task. Starting the
service before we configure it correctly can put the role as failed if
the default configuration don't work on the host.
nginx_minimal defined the nginx_package_name_default variable which was not
used instead of the nginx_default_package_name variable
also fixed debug which was reversed, and add another one to be sure which mode
is used