Extend Parameterization Support

[vjkoskela]

Currently the AbstractHistogramTest supports providing parameterizations for the different histogram factory implementations in order to test aggregators with the different factories. However, if one of those tests needs to be parameterized in a different way (they are very patterned already in some existing cases) then the call to AbstractHistogramTest needs to supply parameters which need to be multiplied together with the factory parameterizations to produce the final parameterization for the test.