[Bug 195197] [netinet6] ipv6 prefix not renewed when managed by userspace daemon with pltime and vltime

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195197

--- Comment #7 from guyyur at gmail.com ---
It fixes the example but there is another scenario that still panics.

# set static ula so can access host even if router is down
ifconfig vtnet0 inet6 fdXX:: eui64

# enable accept_rtadv to learn global address via ra
# rtadvd set to publish fdXX:: so learns ula prefix via ra too
ifconfig vtnet0 inet6 accept_rtadv

# request ra to learn the prefixes from the router
rtsol vtnet0

# flush
ndp -P

In this scenario, when learning fdXX:: prefix via ra it will set ndpr_advrtrs
but the prefix is associated with an address without IN6_IFF_AUTOCONF so the
address won't be purged.

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