REVIEW-1884: check current gradle version is used by the generated wrapper.
REVIEW-1883 use maven only for integTestRuntime
REVIEW-1886: some tweaks to the buildSetup project after reviewing.
change packaging for buildsetup as described in the updated spec.
Change BuildSetup IntegrationTest to extend WellBehavedPluginIntegrationTest
generate empty settings file with empty build.gradle file

- todo add some content to settings and build file to guide the user