on REQUEST packet with no `requested IP address` Kea should respond with NAK

This is expected by RFC: https://www.ietf.org/rfc/rfc2131.txt, page 30, the second bulltet (o).

If there is not requested IP address and ciaddr then Kea should respond with NAK.

Forge test:

tests/dhcpv4/process/test_v4_request_part2.py::test_v4_request_initreboot_no_requested_address
tests/dhcpv4/relay/test_v4_request_relay_part2.py::test_v4_request_initreboot_no_requested_address

Edited Dec 14, 2020 by Michal Nowikowski

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