suricata: Fix ownership and file permissions of files inside /var/lib/suricata.

These files needs to have nobody.nobody as owner but requires read-acces from everyone
to allow the suricata user reading-in this files during startup.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>