Add support for configuring the PROXY_URL_PREFIX independently of the DEPLOYMENT_TYPE for each deployment environment.

- rename the configurations to match the existing ones.

- Update documentation.
- Prompt for white-list
- Update deployment edivorce-django deployment parameters
- Prompt for the network address of the upstream proxy.
- Add a route for SiteMinder
- Refactor/update the Jenkins pipeline scripts.
- Add HorizontalPodAutoscalers to proxy and application configurations.
- Remove monolithic build and deployment templates.
- Refactor and clean up weasyprint configurations.
- Refactor and clean up postgresql configurations.
- Refactor and clean up edivorce-django configurations.
- Refactor and clean up nginx-proxy configurations.
- Refactor Jenkins pipeline configuration.
  - The Jenkins deployment template is not required, as a Jenkins instance is automatically provisioned when the first Jenkins pipeline configuration is deployed into OpenShift.

The new PIP_INDEX_URL parameter is added to allow custom PyPi mirror
URL to be used during the build process.

There are several paramaters that are required but didn't listed as
requested (*). Now, they are marked as required to be explicit.

Signed-off-by: Vu Dinh <vdinh@redhat.com>

* Move OpenShift-specific files to openshift/
* Add note about ephemeral database
* Document how to read logs
* Document one-off cmd execution
* Remove APP_MODULE from templates: should be auto-detected for Django projects.
* Remove gunicorn config file and document APP_CONFIG