Add default audit run task

[nicorikken]

What good is a role when it doesn't include a task to run the script? As simple as it might be, having a simple boolean in the defaults for triggering the task would be easy.

@nicorikken good point; I prepaired this task.
@mboelen Why Lynis returns 78 error code after properly finished report? Is it expected behaviour?

[mboelen]

Then there is a warning. See exit code in man page.