Network observer chart

[c-kruse]

Adds a network-observer chart that

• Runs a single pod with network-observer, prometheus, and one of two reverse proxy containers.
• Has options for service type, ingress and openshift routes
• Obligatory TLS (from pod to edge - LB, Ingress, Route) using either openshift service certs, user-provided cert or skupper issued cert.
• A couple of manifest.yamls generated from the chart.

[fgiorgetti]

It works great. Tested using minikube with generic template, using
a custom htpasswd file and using openshift auth strategy.