Convert each unresolved table as table 65535 (which cannot be used normally).
* Perform s/^ipfw_// for add_table_entry, del_table_entry and flush_table since
these are internal functions exported to keep legacy interface.
* Remove macro TABLE_SET. Operations with tables can be done in any set, the only
thing net.inet.ip.fw.tables_sets affects is the set in which tables are looked
up while binding them to the rule.
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