conf: Set net->model earlier
conf: Set net->model earlier

So later code can more easily access def->model

Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Signed-off-by: Cole Robinson <7cd45ff6ad1fb7cf556a02797d774247851499f8@redhat.com>

libvirt/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,crobinso/libvirt,zippy2/libvirt,libvirt/libvirt,eskultety/libvirt,libvirt/libvirt,jardasgit/libvirt,eskultety/libvirt,jfehlig/libvirt,zippy2/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,nertpinx/libvirt,crobinso/libvirt,eskultety/libvirt,nertpinx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jardasgit/libvirt,libvirt/libvirt,olafhering/libvirt,andreabolognani/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,crobinso/libvirt,eskultety/libvirt,olafhering/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jardasgit/libvirt,jardasgit/libvirt,fabianfreyer/libvirt