Add option for custom restart scripts

[mabezi]

As the title says: It would be great to have the possibility to define your own restart scripts.
There are quite a few possible uses for this.

And this form of implementation gives you maximum leeway, as you can either write them directly into the variable definition or read them from a file using lookup.

Examples:

needrestart_restartd:
  - name: unbound
    script: "echo "restart unbound!" && systemctl restart unbound.service"

needrestart_restartd:
  - name: unbound
    script: "{{ lookup('template', 'files/custom-restart', errors='strict') }}"

[mabezi]

fixed two typos

[t2d]

Cool, that looks useful. Can you please fix the linting issue?

[mabezi]

That should fix it now. ansible-lint and I somehow don't become friends 😄