Stealth mode

[tomchop]

Add a switch to make sure Malcom does not communicate with external infrastructure:

• Prevent rDNS when sniffing and detecting IPs
• Prevent DNS resolutions in analytics module
• Prevent IP to AS resolutions
• Make all the above configurable?

[DigiAngel]

Oh yes please on this. After starting the docker instance over 10K dns requests start...it would be nice to not have malcom do this. Thank you!

[tomchop]

Unfortunately I have less and less time to allocate to malcom. Doing this should not be very complicated - a switch in the configuration file and conditions on the analytics. I'll see if I can do it soon-ish, otherwise I'm happy to receive PRs :)