(packaging) (#20148) Fix logrotate script on distros with logrotate >= 3.8

logrotate versions >= 3.8 complain about permissions unless the su directive
is used to explicitly set user and group.

This commit adds the correct su directive to the puppetdb logrotate script for
Debian >= 7, Ubuntu >- 13.04, EL >= 7, all supported Fedora versions and SLES >= 12.