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