Document how to run a reverse proxy to add synse in the URLs.

[MatthewHink]

This gives backward compatibility with v2 urls where synse was part of the url.

This may be the way to do it?

https://www.elvinefendi.com/2018/08/08/ingress-nginx-proxypass-to-external-upstream.html

[edaniszewski]

transferred issue here from synse SDK since URL definition is in synse-server