Add audit rotation to base config

[cornelinux]

A fresh installation on privacyIDEA is currently missing a audit rotation cron job.

We should add it to "deploy/crontab/privacyidea" but in comments like:

#1 2 * * *	privacyidea	pi-manage audit rotate_audit --age 360

This way we can avoid to interfere with already existing configurations.

@plettich @fredreichbier any idea how to handle existing installations?

[fredreichbier]

Hm, just an idea: We could also use our "Periodic Task" feature and add a "Audit Rotation" task module. On fresh installations, we could add a periodic audit rotation task that is inactive by default. By this, we could avoid modifying "deploy/crontab/privacyidea" at all.

[cornelinux]

sounds nice!

[cornelinux]

@pablo-knight please also add cron config to the CentOS/RHEL packages.