rix-rs2/ipv4: show protocols all Megagroup

Megagroup BGP --- start 2021-07-07 Passive

Description:    Megagroup/60357/AS60357
  BGP state:          Passive
    Neighbor address: 193.27.39.18
    Neighbor AS:      60357
    Local AS:         49634
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   500
      Action:       disable