ISPN-2772 Implement REPLICATED mode as a degenerated DISTRIBUTED mode (nowOwners>=clusterSize)

* Limitation: For REPL test we still use only one segment for now
* Some core tests are converted to new config style to be able to override numSegments to 1.
* Also fixes ISPN-3133.

Please integrate in master. 

JIRA: https://issues.jboss.org/browse/ISPN-2772,
https://issues.jboss.org/browse/ISPN-3133