Extended support for access models that have heterogeneous subscriber types

We support both four-level and five-level scheduler hierarchies for copper to the building (CuTTB), fiber to the home (FTTH), and fiber to the building (FTTB) networks that have both business and residential PPPoE subscribers. We support a network that includes all of the following subscriber types: PPPoE terminated residential, PPPoE business using Extensible Subscriber Services Manager (ESSM) op-scripts, PPPoE tunneled LAC, and L2BSA. The networks can include both conventional DSL and hierarchical access (CuTTB, FTTH, and FTTB) at the same time.