spb-rs2/ipv4: show protocols all Linkey

Linkey BGP --- start 2019-10-29 Connect Socket: No route to host

Description:    Linkey/13002/AS-LINKEY
  BGP state:          Connect
    Neighbor address: 31.44.186.141
    Neighbor AS:      13002
    Last error:       Socket: No route to host
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable