Java selenium test

Please review the changes for blackbox integration testing for Fronts. This is a new module so check out the readme.md file under <root>/integration-test/java-selenium. It contains a description and how to run the tests locally.
The pointer to the README is in the pull request description, did you mean somewhere else?

The reason STAGE has to be TEST is because AWS and, later, content-api configuration values need to point to Wiremock stub HTTP server.