Enable DHCPv6 client

nl6720requested to merge
nl6720/arch-boxes:DHCPv6 into master

Set DHCP=yes in /etc/systemd/network/80-dhcp.network to start both DHCPv4 and DHCPv6 clients. This provides IPv6 for networks using DHCPv6 without RA.

It should not have much effect of networks with working RA since the IPv6AcceptRA option is enabled by default for these connections anyway.

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