[Bug 205285] [regression] Duplicated IPv6 localhost addresses after r291643

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205285

            Bug ID: 205285
           Summary: [regression] Duplicated IPv6 localhost addresses after
                    r291643
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fk at fabiankeil.de
          Keywords: regression

After r291643, upping a cloned interface results in ::1 getting assigned to it:

[fk at kendra ~]$ sudo ifconfig lo1 create
[fk at kendra ~]$ ifconfig lo1 
lo1: flags=8008<LOOPBACK,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        groups: lo 
[fk at kendra ~]$ sudo ifconfig lo1 up
[fk at kendra ~]$ ifconfig lo1
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128 tentative 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        groups: lo

This broke my pf configuration as it resulted in invalid NAT rules.

After reverting r291643, everything works as expected again.

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