core/ipv4: show protocols all NETSHELTER_KLEYREX_V4

NETSHELTER_KLEYREX_V4 BGP --- start 2021-07-12 Active Socket: Connection closed

Description:    Netshelter Transit IPv4 at Kleyrex
  BGP state:          Active
    Neighbor address: 193.189.82.238
    Neighbor AS:      41047
    Local AS:         213127
    Connect delay:    0.253/5
    Last error:       Socket: Connection closed
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   ACCEPT
    Output filter:  export_v4_rule