[NSE][patch] targets-sniffer: sniff IPv6 addresses, fix newtargets for -6

[Daniel Miller <bonsaiviking () gmail com>]

List,

Here's a patch to add IPv6 address sniffing to targets-sniffer. The 
major difference is changing the BPF from "ip" to "ip or ip6". I had to 
add a couple checks for NDP multicast addresses to check_if_valid, and I 
may have missed some other invalid IPv6 addresses.

I also fixed an issue (not quite a bug) where targets would be added 
with newtargets even if they were not of the current address_family. 
This resulted in lots of lines like this:
> Failed to resolve given IPv6 hostname/IP: 192.168.1.1.  Note that you 
> can't use '/mask' or '[1-4,7,100-]' style ranges for IPv6.

Hope everyone finds it useful!

Dan

Attachment: targets-sniffer-ip6.diff
Description:

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