fix(dhcp4): log DHCP4_REQUEST at lower debug level for consistency #147
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Issue:https://gitlab.isc.org/isc-projects/kea/-/issues/3761
This change lowers the debug severity of the DHCP4_REQUEST log message from
DBG_DHCP4_DETAILtoDBGLVL_COMMAND.DHCP4_PACKET_RECEIVED.