Yu Watanabe f39c071f31 dhcp-client-send: introduce dhcp_client_send_message()
This internally uses sd_dhcp_message object, and replaces functions
for creating and sending DHCP messages.

By using sd_dhcp_message internally, now we can correctly send long
(> 255 bytes) option data that cannot be fit in a single DHCP option TLV.

This also fixes the value in DHCP option 57 (Maximum Message Size).
Previously the IP and UDP header size is subtracted from the interface
MTU, but it should not.

Except for the above, this should not change any effective behaviors.
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Systemd

System and Service Manager

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