This drop delay after ACK, as it has many problems. See comment in sd_dhcp_client_is_waiting_for_ipv6_connectivity() for more details. This way, the logic becomes much much simpler. Also, do not restart the client if we lost IPv6 connectivity in sd_dhcp_client side, but restart the client by networkd. As, sd_dhcp_client does not know if we can start the client or not, e.g., the interface may be currently down.
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