Implement DHCP IPv6-Only preferred option.
An IPv6-capable host includes this option in the Parameter Request List option and willing to forgo obtaining an IPv4 address for a specific assigned period(V6ONLY_WAIT). DHCP server responds with DHCPOFFER or DHCPACK with this option if network can provide IPv6 connectivity. Currently whether or not including IPv6-only preferred option in the PRL is controlled by experiment flag. Bug: 159670487 Test: atest NetworkStackTests NetworkStackIntegrationTests Change-Id: I89653271197164a7b7f638c43cb3bf4d28817b9f
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