Rename files to pass on maven enforcer

[abstractj]

Project won't build due to maven enforcer rules which checks for keycloak.json, but most of projects have keycloak-example.json. We have 2 alternatives, change these files or change the rules at maven-enforcer plugin. Because I was not sure if we wanted to change the rules, I renamed it.

Some of the errors mentioned:

[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-files-exist) @ rh-sso-app-jee-html5 ---
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.RequireFilesExist failed with message:
Some required files are missing:
/home/abstractj/opensource/keycloak/keycloak-quickstarts/app-jee-html5/config/keycloak.json

[stianst]

Hey! Read the READMEs ;)