Code review integration for Dockerfile (tagged images)
- Remove existing ENV variables from parent Dockerfile
- Allow KB version to be purely passed through MAkefile env variable
Code review integration for Dockerfile (base image)
- Add user admin:admin to allow sudo'ing inside the container
  (Note this will only work when there is a tty attached to the shell)
- Remove KB version from raw Dockerfile
Small refactoring in installer (Code review)