AMBARI-3634. Load service configurations based on config-group selection. (srimanth)
AMBARI-3644. App.ServiceConfig needs 'defaultsProvider' mechanism. (onechiporenko via srimanth)
Revert "AMBARI-3054. User Preference to show 'Background Operations'.(xiwang)"

This reverts commit b6f0bc4e5542e3155012aea118dcac3f94c6ac4f.