knot-resolver init: fix IPv6 detection
The main thing is using ping6, as non-busybox ping doesn't support -6 I also switch to directly pinging addresses (of ODVR so they're static), as that seems more reliable than depending on DNS.
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The main thing is using ping6, as non-busybox ping doesn't support -6 I also switch to directly pinging addresses (of ODVR so they're static), as that seems more reliable than depending on DNS.