spb-rs2/ipv4: show protocols all gfn

gfn BGP --- start 2021-02-12 Passive

Description:    gfn/50889/AS50889
  BGP state:          Passive
    Neighbor address: 185.1.153.30
    Neighbor AS:      50889
    Local AS:         50817
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable