Create an adapter class for utility classes in org.infinispan.test package for use by ispn-arq project

This class should allow external access to methods from classes like MultipleCacheManagersTest, AbstractCacheTest, AbstractInfinispanTest, SingleCacheManagerTest and it will be used by infinispan-arquillian-container project. A possible name for it would be DatagridManager and it will be injected into a test class. Users will then use it to form a cluster of cache managers/caches in ispn-arq-container in order to test embedded mode of Infinispan.