Ant-XGBoost end-to-end test prints too much log

[wangkuiyi]

It is over 100 lines.

$ docker run --rm --net=host -v /var/run/docker.sock:/var/run/docker.sock -v $HOME/.kube:/root/.kube -v /home/$USER/.minikube/:/home/$USER/.minikube/ -v $GOPATH:/go -w /go/src/github.com/sql-machine-learning/sqlflow sqlflow:latest bash scripts/test_e2e.sh
 * Starting MySQL database server mysqld
   ...done.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql: [Warning] Using a password on the command line interface can be insecure.
2019/09/05 06:28:43 Launch server with insecure mode.
2019/09/05 06:28:43 Server Started at :50051
[TerminalIPythonApp] WARNING | Unknown error in handling startup files:
1 row affected
0 row affected
2 rows affected
UsageError: Line magic function `%autoreload` not found.
.
----------------------------------------------------------------------
Ran 1 test in 0.039s
OK
[TerminalIPythonApp] WARNING | Unknown error in handling startup files:
time="2019-09-05T06:28:48Z" level=info msg="tensorflowCmd: run locally" package=sql
WARNING:root:======xgboost training config======
{
  "xgboost_conf": {
    "params": {
      "objective": "multi:softprob",
      "booster": "gbtree",
      "seed": 0,
      "num_class": 3,
      "eta": 0.3,
      "max_depth": 5,
      "tree_method": "approx",
      "nthread": 2,
      "convergence_criteria": "-1:0:1.0"
    },
    "num_boost_round": 30,
    "auto_train": false
  },
  "data_conf": {
    "data_source": {
      "name": "sqlflow",
      "config": {
        "is_train": true,
        "standard_select": "SELECT * FROM sf_home.sqlflow_training_train",