AbstractCacheTest.getDefaultClusteredCacheConfig() should not disable state transfer

The number of tests that use AbstractCacheTest.getDefaultClusteredCacheConfig() and actually require state transfer to be disabled is insignificant: after commenting out the line that disables ST, I got 0 failures.

The Infinispan default is to have state transfer enabled, so developers naturally assume that state transfer is enabled all the time. It would be much clearer if AbstractCacheTest.getDefaultClusteredCacheConfig() used the same defaults.