vacuum: reorder some of ctdb_process_delete_list() more intuitively

vacuum: reorder some of ctdb_process_delete_list() more intuitively

Now that the nodemap and its talloc children don't hang off of the
delete_records_list talloc context, we can build the nodemap
and earlier, and move the construction of the delete_records_list
to where it is more obvious what it is used for.

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-By: Amitay Isaacs <amitay@gmail.com>
(This used to be ctdb commit e3740899c1af6962f93c85ad7d1cb71bddce45c6)