devel/libvirt: improve configuration file handling

[novel]

Summary

Use @sample to avoid overwriting default network configuration
on re-installs.
In order to prevent overriding user's configuration across reinstalls, do the
following:

• Networks configuration goes into %%EXAMPLESDIR%%
• pkg-message moved to files/pkg-message.in to allow substitution and updated with instructions how to enable default network
• While here, convert virtlockd.conf to use @sample

PR: 203865

[mat]

Makefile

144

So, you're removing the symlink in the ports Makefile to do it again here, I fail to see the point.

[novel]

Makefile

144

When port's Makefile creates the symlink, the 'default.xml' doesn't exist yet (because @sample will create it only in post-install). I'm wondering if it could have any implications?

[mat]

Makefile

144

Mmm, ok, sounds somewhat sensible, strange way of doing configuration things