Simplified cluster testing

[alanconway]

The problem

Cluster testing currently requires deploying COO for korrel8r plus all the signal stacks from github.com:/korrel8r/config/openshift. The upstream COO has to be source-modified to enable openshift extensions and to use test images. Alternatively devspace can replace images on the fly, but openshift still has to be modified to enable openshift.

Goals

• No requirement for COO, run panel and korrel8r indepenently
• Run from localhost: no images, run korrel8r and the panel outside the cluster.
• Rebuild is reflected immediately in cluster.
• Local doc and script to deploy signals using github.com:/korrel8r/config/openshift

[PeterYurkovich]

Could just use a helm chart to install korrel8r and the TP, and then devspace to connect to the TP deployment and take it over. Issue is that helm charts are never updated and always go out of date, but with COO we at least know it is basically forced to be up to date