MVPN feature support with sharding

We support the following features:

• Multicast virtual private network (MVPN) inactive route query from the main thread to shards
• Extranet and auto-export support with sharding
• Interact functions with RT-proxy client and server
• New data structure to store the inactive route data on the main thread
• Asynchronous route processing on the main thread

You can use show mvpn c-multicast to display the inactive route data stored on the main thread.