the ctdb structure must make its own copy of the ->address field and not just

the ctdb structure must make its own copy of the ->address field and not just
copy the content of the nodes structure.

this ctdb_address structure contains a pointer which is talloced hanging off the structure itself.
If we copy the content of this structure as we did in assigning to ctdb->address from nodes[i]
then if we talloc_free() the node structure we end up with a wild pointer in ctdb->address