CLI command parity for carrier-grade NAT and stateful firewall

New operational commands and configuration options provide information previously available only when using the MS-DPC as the services PIC. 

• To display information equivalent to that provided by show services stateful-firewall flow-analysis for the MS-DPC, use show services sessions analysis for the MS-MPC. 
• To display information equivalent to that provided by show services stateful-firewall subscriber-analysis for the MS-DPC, use show services subscriber analysis for the MS-MPC. 
• To drop sessions after a certain session setup rate is reached, include the new CLI option max-session-creation-rate at the [edit services service-set service-set-name] hierarchy level.