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  statement in the default classification rule.
- Fix function calls to expression evaluation functions.

- Hang onto the incoming packet so that it can be used in dhcp_reply when
  cons_options is called.

- Rototill function prototypes.

  to the incoming packet, if any, the current lease, if any, the parsed
  incoming options, and the in-scope configuration file options.
- Incoming packets are now reference counted, so that the callee can save
  them for later expression evaluation (e.g., in dhcp_reply).