[Bug 195502] Support IPv6 addresses in /etc/rc.d/netwait

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195502

--- Comment #2 from Roger Leigh <rleigh at codelibre.net> ---
I've attached a slightly updated patch.  However, in practice I don't think
either patch is fully correct--if the IPv6 address isn't available to due SLAAC
taking a while in my case, then the timeout isn't respected.  This is because
it loops through all the $netwait_timeout count in a second or so--ping6 isn't
waiting one second before terminating.  However using -X 1 on the command-line
shows this is working as documented if I try with an invalid IPv6 address, but
maybe the behaviour is different if there's no global IPv6 address as during
boot.

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