pkgbase: Create a FreeBSD-newsyslog package

This allow one to install it without having to install FreeBSD-utilities.
While here put some newsyslog.d file in their own package.

MFC after: 2 weeks
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D33456

(cherry picked from commit 26ea904caae7e6be8394eb8ca94f282d99f63c8c)