msk-rs1/ipv4: show protocols all firstline

firstline BGP --- start 2020-09-01 Passive Error: BFD session down

Description:    firstline/43267/AS-LINETEL
  BGP state:          Passive
    Neighbor address: 185.1.161.12
    Neighbor AS:      43267
    Local AS:         49869
    Last error:       Error: BFD session down
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable