DECLINE packet with no 'server id' option should be dropped by Kea
But it is not dropped. Kea does not check for presence of 'server id' option. It is required according https://www.ietf.org/rfc/rfc2131.txt, page 38.
Forge tests:
- tests/dhcpv4/process/test_v4_decline.py::test_v4_decline_fail_without_serverid
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