DATACMNS-485 - Fixed bug in ParameterizedTypeInformation.hashCode().

Previously, ParameterizedTypeInformation.hashCode() had been inconsistent to equals in case of a fully resolved parameterized type. This is now fixed by not including the parent reference in case a parameterized type is resolved completely.

Also, TypeDiscoverer.getActualType() does not return the component type for non-collection/non-maps anymore to make sure we don't accidentally unwrap parameterized types.