logrotate: Fix configuration file

Previously the ovirt-node configuration file for logrotate had an
invalid syntax, this prevented augeas from beeing able to edit it.
Now the syntax of the file is fixed. Additionally some code has been
migrated to the new codebase.

Change-Id: I1541695ce7199f260b76d8dd9d570888ac09a45f
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=979296
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>