Use 3 nodes for clustered all tests #5406
Merged
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Motivation:
ClusteredSharedCounterTest
uses only 2 nodes. When testing with Hazelcast CP subsystem, we need 3 nodes, using 3 nodes makes it easier for us to re-use the test.I have also unified the common parts in the clustered tests. There is some code duplication, but we can't simply create a common parent to move the code there, because they already extend other classes. Maybe a junit rule would make sense here. Let me know if you want to do something with the duplication, it was already there before this PR.