BIER-TE extensions for Packet Replication and Elimination Function (PREF) and OAM

This specification extends Bit Index Explicit Replication - Traffic Engineering (BIER-TE) forwarding to support in the data plane the DetNet Packet Replication and Elimination Functions (PREF). It also provides traceability of links/adjacencies where replication and loss happen, in a manner that is agnostic to the forwarding information (OAM).