NSR, IGP-FA, and static route on container LSPs

Container label-switched paths (LSPs) provide support for nonstop active routing (NSR), IGP forwarding adjacency (FA), and static routes to address the requirements of a wider business case. NSR synchronizes the LSP state between redundant Routing Engines, thereby reducing the time to rebuild the container LSP upon a Routing Engine switchover and avoiding traffic loss. Because IGP-FA and static routes are widely deployed for RSVP point-to-point LSPs, and container LSPs are dynamically created point-to-point LSPs, these features are also required to fully deploy container LSPs in the field.