Merge branch 'ping6-SOL_IPV6'

Jakub Kicinski says:

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net: ping6: support setting basic SOL_IPV6 options via cmsg

Support for IPV6_HOPLIMIT, IPV6_TCLASS, IPV6_DONTFRAG on ICMPv6
sockets and associated tests. I have no immediate plans to
implement IPV6_FLOWINFO and all the extension header stuff.
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Signed-off-by: David S. Miller <davem@davemloft.net>