Externalize KIE Server connection configurations in the Web app

[kmacedovarela]

Currently it is necessary to manually configure the kie server endpoint in the web application.

A good strategy would be to have a default, but allow to use a parametrized kie server url, user and password. In this scenario, these information could be set via environment variable for example.

Here's an example:

• Parametrized JS Code: https://github.com/jbossdemocentral/rhdm7-qlb-loan-demo/blob/master/support/application-ui/decisionServerClient.js#L25-L32
• Default config for local run: https://github.com/jbossdemocentral/rhdm7-qlb-loan-demo/blob/master/support/application-ui/config/config.js
• Retrieving KS route via CLI: https://github.com/jbossdemocentral/rhdm7-qlb-loan-demo/blob/master/support/openshift/provision.sh#L367-L373
• Updating the configuration in config map on OCP: https://github.com/jbossdemocentral/rhdm7-qlb-loan-demo/blob/master/support/openshift/provision.sh#L379-L386