ipv6: only save scopeid when it is required
ipv6: only save scopeid when it is required

The kernel only requires that we supply a scope id to bind() when the
source address is of certain types, so lets only save/supply the scope id
in these cases.

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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