[db-wg] Creating route objects without mnt on existing ones

Hi there

It seems to be impossible to create route objects for inet(6)nums, if 
there are other route objects to which your maintainer has no access.

Even if you have mnt-by + mnt-routes on the inet(6)nums.

Due to that, it's much more difficult to create new route objects for 
our customers, as we have to contact the maintainer of all existing 
objects in order to get mnt-by/mnt-routes on their route objects.

In my opinion, that makes zero sense. If you have mnt-by/mnt-routes on 
an inetnum, you should be able to create objects, regardless of existing 
ones.

Best regards
Patrick