netlink: Re-order 1.public, 2.private, 3.complex

Reorder the module parts according with
    1.public,
    2.private,
    3.complex

This way it is much easier for onlookers to find what they look for
and puts the complex guts of the module right at the end.

Change-Id: I59f433cfda49454f0ce99b4590b713b40a7d3469
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/26563
Reviewed-by: Dan Kenigsberg <danken@redhat.com>