A Generative Controller is a controller that controls the creation of test cases.
Generative Controllers do not contain sub-controllers . Their purpose is to describe a specific test case and to
provide the logic necessary to create that test case.
Generative Controllers can hold config elements that provide default values, or additional information
about the test.
Although one can add cookie managers and authorization managers, it's almost always
preferable to add such elements at the ThreadGroup level.