Updates

- draft-ietf-p2psip-base-26
    - dataModel and TopologyPlugin were replaced by variables.
    - Added DataModel and TopologyPlugin enum types.
    - Added LeaveAns and ChordUpdateAns structures.
    - Renamed ChordUpdate structure to ChordUpdateReq.
    - Redefined NodeIdLength as a variable/
    - Nits
- draft-ietf-p2psip-drr-04
- draft-ietf-p2psip-rpr-04
    - definition for RouteMode.RPR was moved in this new draft.
- draft-ietf-p2psip-diagnostics-10
    - DiagnosticExtensionRequestType enum renamed to DiagnosticKindId.
- draft-ietf-p2psip-service-discovery-08
- draft-ietf-p2psip-self-tuning-08
    - MessageExtensionType.self_tuning_data is now officially assigned
      the codepoint 3.
- draft-ietf-p2psip-share-01
    - Codepoint 17 assigned to KindId.ACCESS-CONTROL-LIST.