gw4/ipv4: show protocols all p_maintbl

p_maintbl Pipe master up 2017-07-04 => ebgp

Preference:     70
  Input filter:   (unnamed)
  Output filter:  REJECT
  Routes:         1596 imported, 0 exported
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:         883586          0        249          0     883337
    Import withdraws:        29038          0        ---          0      28830
    Export updates:         883337     883337          0          0          0
    Export withdraws:        28830          0        ---          0          0