audit service: Explicitly call auditctl to disable everything

Otherwise, journald might be starting auditing.
Some reading:
    - https://fedorahosted.org/fesco/ticket/1311
    - https://github.com/systemd/systemd/issues/959
    - https://github.com/openSUSE/systemd/commit/64f83d3087402c6f8730c1bc4b8fac59b84d4666