AS7-4460 TS: speed up by ignoring the whole test class rather than each @Test separately
AS7-4460 TS: custom containers wireframe with extension to shutdown containers on AfterSuite event
AS7-4460 TS: introduce ClusteringAbstractTestCase and rework tests to leverage custom containers
AS7-2448 TS: use Logger; fix certain System.out-s not being seen anywhere
AS7-4460 TS: adapt NonHaWebSessionPersistenceTestCase to custom containers
Clustering TS: running the formatter to consider enabling checkstyle in here