IntegrationTestRSGroup is broken

There are several problems:
1. It doesn't work in minicluster mode because in afterMethod() it using IntegrationTestingUtility.restoreCluster() which just shutdown minicluster in the not distributed mode
2. It uses tests from TestRSGroups which was supposed to be common for both unit and integration tests, but for last two years, there were a number of tests added that are using internal API, not compatible with the distributed mode.