The script was generating the data-* files that later copies to the
container.
In order to the files being reusable for nm-in-vm, put them as separate
files inside the data directory.
However, some of the files need the full path to NetworkManager project,
which varies for each user. Instead, make a sed replacement on them and
generate the actual files that will be copied. Replacement:
{{BASEDIR_NM}} -> $BASEDIR_NM
Also, rename the files to more descriptive names, using some prefixes
that give a hint of where those files will be put, and the .in extension
to indicate that they will be processed.
nm-in-vm can use the same generated files than nm-in-container, so let's
move them to a place common for both: tools/nm-guest-data.
With this change, it is not worth it to have the nm-in-container
directory, so move the script to tools and delete the subdirectory.
