select ipv4 only pcb when we have both ipv4 and ipv6 pcbs in function in_pcblookup_hash().
select ipv4 only pcb when we have both ipv4 and ipv6 pcbs in function
in_pcblookup_hash().

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame