Imagemode might have separate /var partition not properly initialized by
package installation. Add creation of compat files into tmpfiles.d
definition.
Make copies of those files from /var/named to /usr/shared/named, so we
even have some place to symlink them from. Originally it had only copy
in sample documentation, which may not be installed.
These source file should be read-only from named and not modified
anyway. Copy them to /usr/share/named as read-only, always present
sources. Make symlinks in /var/named to point to them only when files
are missing.
To maximize backward compatibility, make copies and avoid replacing
those files with symlinks.
Resolves: RHEL-122168
