[Bug 225063] Add ifconfig_DEFAULT_ipv6 for fallback like ifconfig_DEFAULT

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225063

            Bug ID: 225063
           Summary: Add ifconfig_DEFAULT_ipv6 for fallback like
                    ifconfig_DEFAULT
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: conf
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: xistence at 0x58.com

I recently started playing with an Pine64 board using the latest ARM images
available for CURRENT, and I noticed that there is a:

ifconfig_DEFAULT="DHCP"

Which is used as the fallback for allowing whatever interfaces exist and don't
have explicit configuration to reach out over DHCP.

I'd like to have a similar flag for IPv6, so that the default could ship with
IPv6 enabled in /etc/rc.conf as well so that devices are automatically
dual-stacked by default.

ifconfig_DEFAULT_ipv6="inet6 accept_rtadv"

Could also be useful for VM images where the device name may not be known ahead
of time due to the emulated hardware

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