Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Move all the newsyslog related configs to usr.sbin/newsyslog/

This is related to pkgbase and changes these to use CONFS so that these are
tagged as config files.

Approved by: AllanJude (mentor)
Sponsored by: Essen Hackathon
Differential Revision: https://reviews.freebsd.org/D16694