msk-rs2/ipv4: show protocols all imperva

imperva BGP --- start 2021-05-09 Passive BGP Error: Hold timer expired

Description:    imperva/19551/AS-INCAPSULA
  BGP state:          Passive
    Neighbor address: 185.1.160.227
    Neighbor AS:      19551
    Local AS:         49869
    Last error:       BGP Error: Hold timer expired
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable