GET /api2/tm/rulesets/<set_id>/lags/ viewer
POST /api2/tm/rulesets/<set_id>/lags/ user
GET /api2/tm/rulesets/<set_id>/lags/<LAG_id> viewer
PUT /api2/tm/rulesets/<set_id>/lags/<LAG_id> user
DELETE /api2/tm/rulesets/<set_id>/lags/<LAG_id> user{
"id": 1,
"set_id": 10,
"name": "lag_name",
"ports": [{"id":0, "type":"INF"}, ...],
}