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This pull-request adds support for IPv6 SIP servers, which can be obtained from DHCPv6 options. [RFC3319](https://www.rfc-editor.org/rfc/rfc3319.html) defines two options for this: option 21 (SIP Servers Domain Name List) and option 22 (SIP Servers IPv6 Address List). systemd-networkd currently only supports IPv4 SIP servers, but ISPs like NTT EAST provide IPv6 SIP servers. Exposing this in the D-Bus API would allow other programs, such as downstream DHCPv6 servers, to utilize it. Usage: ``` [DHCPv6] UseSIP=yes ``` Partial output of `run0 systemd-networkd-tests.py NetworkdDHCPClientTests.test_dhcp_client_use_sip`: ```console > networkctl status veth99 ● 17: veth99 NetDev File: /run/systemd/network/25-veth.netdev Link File: /usr/lib/systemd/network/99-default.link Network File: /run/systemd/network/25-dhcp-client.network └─/run/systemd/network/25-dhcp-client.network.d/override.conf State: routable (configured) Online state: online Type: ether Kind: veth Driver: veth Hardware Address: 12:34:56:78:9a:bc MTU: 1500 (min: 68, max: 65535) QDisc: noqueue IPv6 Address Generation Mode: eui64 Number of Queues (Tx/Rx): 2/2 Auto negotiation: no Speed: 10Gbps Duplex: full Port: tp Address: 192.168.5.181 (DHCPv4 via 192.168.5.1) 2600::15 fe80::1034:56ff:fe78:9abc Gateway: 192.168.5.1 fe80::1034:56ff:fe78:9abd SIP: 192.168.5.1 2600::1 foo.example.com Activation Policy: up Required For Online: yes DHCPv4 Client ID: IAID:0x7ec6b6c/DUID DHCPv6 Client IAID: 0x7ec6b6c DHCPv6 Client DUID: DUID-EN/Vendor:0000ab11617740de1342c3a2 ```