rix-rs1/ipv4: show protocols all ulan

ulan BGP --- start 2021-02-10 Passive

Description:    ulan/48128/AS48128/via IPTP
  BGP state:          Passive
    Neighbor address: 193.27.39.114
    Neighbor AS:      48128
    Local AS:         49634
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable