docs: def coupleTo_vswitch(userid, vswitch_name):
      """ Couple to vswitch.
  
      Input parameters:
      :userid:            USERID of the guest, last 8 if length > 8
      :network_info:      dict of network info
      """
      print("\nCoupleing to vswitch for %s ..." % userid)
      vswitch_info = client.send_request('guest_nic_couple_to_vswitch', 
                                         userid, '1000', vswitch_name)
  
      if vswitch_info['overallRC']:
          raise RuntimeError("Failed to couple to vswitch for guest %s!\n%s" % 
                             (userid, vswitch_info))
      else:
          print("Succeeded to couple to vswitch for guest %s!" % userid)