devel/libvirt: improve configuration handling
libvirt stores various configuration objects in XML files and
also uses symlinks to enable/disable various things. While
using @sample could prevent from touching user-modified configs,
it is quite cumbersome to preserve state of enabled or disabled
symlink controlled objects across reinstall.
In order to address this situation:
- Install these configuration files into %%EXAMPLESDIR%%,
- Update pkg-message with instructions how to apply the default configuration if user wants to. Also, pkg-message moved to files/pkg-message.in to allow substitution,
- While here, convert virtlockd.conf to @sample
- Bump PORTREVISION