Since ARC++ means we must inherit from ArcTest too, we cannot reach enterprise_policy_base.py's setup() and initialize() via super.  Move the content of these functions to something like policy_base_setup() and policy_base_initialize() and then call those functions from setup() and initialize().  Non-ARC++ use case will not change, but ARC++ tests can call this function as well as ArcTest's function (via super()).