BACKPORT: ipv6/dccp: do not inherit ipv6_mc_list from parent

Like commit 657831ff ("dccp/tcp: do not inherit mc_list from parent")
we should clear ipv6_mc_list etc. for IPv6 sockets too.

Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 83eaddab)
Signed-off-by: Connor O'Brien <connoro@google.com>

Change-Id: I6bcb4627885b7444949852f580a901fdae409349