ISPN-2272 Remove the use of deprecated methods from the core test suite ...

...(including utility classes used by other tests) and all other modules affected by this

https://issues.jboss.org/browse/ISPN-2272

This is rather big, but hopefully (mostly) harmless. This PR doesn't yet remove the deprecated methods from our API which refer to org.infinispan.config yet, as that will be part of a future PR.