baserev update by copy to link target

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- update to 1.7.8:
  + Introduced support for eBPF for all daemons: if SO_REUSEPORT is
    supported by the OS and eBPF support is compiled in, this allows
    to load a custom load-balancer. To load-share, daemons have to
    be part of the same cluster_name and each be configured with a
    distinct cluster_id.
  + Introduced support for listening on VRF interfaces on Linux for
    all daemons. The feature can be enabled via nfacctd_interface,
    bgp_daemon_interface and equivalent knobs. Many thanks to
    Marcel Menzel ( @WRMSRwasTaken ) for this contribution.
  + pre_tag_map: introduced limited tagging / labelling support for
    BGP (pmbgpd), BMP (pmbmpd), Streaming Telemetry (pmtelemetryd)
    daemons. ip, set_tag, set_label keys being currently supported.
  + pre_tag_map: defined a new pre_tag_label_encode_as_map config
    knob to encode the output 'label' value as a map for JSON and
    Apache Avro encodings, ie. in JSON "label": { "key1": "value1",
    "key2": "value2" }. For keys and values to be correctly mapped,
    the '%' delimiter is used when composing a pre_tag_map, ie.
    "set_label=key1%value1,key2%value2 ip=0.0.0.0/0". Thanks to
    Salvatore Cuzzilla ( @scuzzilla ) for this contribution.
  + pre_tag_map: introduced support for IP prefixes for src_net
    and dst_net keys for indexed maps (maps_index set to true).
    Indexing being an hash map, this feature currently tests data
    against all defined IP prefix lenghts in the map for a match
    (first defined matching prefix wins).
  + pre_tag_map: introduced two new 'is_nsel', 'is_nel' keys to
    check for the presence of firewallEvent field (233) and
    natEvent field (230) in NetFlow/IPFIX respectively in order
    to infer whether data is NSEL / NEL. If set to 'true' this
    does match NSEL / NEL data, if set to 'false' it does match

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