Update is_RFC1918_addr
Update is_RFC1918_addr

Adjust func to accept ipv4 and ipv6 addrs, and change func name since private ipv6 addrs handled by different RFC.
CommunityHoneyNetwork/CHN-Server,CommunityHoneyNetwork/CHN-Server,CommunityHoneyNetwork/CHN-Server,CommunityHoneyNetwork/CHN-Server