Expanded traffic rate adjustment for DSL access lines

The traffic rate adjustment feature is expanded to support PPPoE intermediate agent (PPPoE-IA) tags by processing the Vendor-Specific-Tags TLV in PADI and PADO packets received from the access node. Now both PPPoE subscriber connections (terminated and tunneled) and ANCP-triggered Layer 2 wholesale service connections are subject to the same class and quality-of-service management transformations. Configuration for traffic rate adjustment and reporting for both AAA and CoS is moved to the new [edit system access-line] hierarchy level. In earlier releases, DSL line traffic rate adjustment is available only for the ANCP agent and uses statements at the [edit protocols ancp] and [edit protocols ancp qos-adjust] hierarchy levels.