start ckan script configurable/editable

[jbrown-xentity]

User Story

As a Docker-CKAN user, I need to be able to utilize a different way to serve the application without copying and pasting code

Details

The current start.sh scripts include much more activity and commands than simply turning on the server. It would be nice to split out lines 1-17, and run these files in sequence. Then a downstream user like catalog.data.gov can implement a start script much easier than copying and replacing code.

To be clear, this should be done for ckan, ckan-base, and ckan-dev, although currently we use ckan-dev as our deployment is test only.