msk-rs2/ipv4: show protocols all flex

flex BGP --- start 2020-09-25 Passive

Description:    flex/21453/AS-FLEX
  BGP state:          Passive
    Neighbor address: 185.1.160.159
    Neighbor AS:      21453
    Local AS:         49869
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable