### What changes were proposed in this pull request?
This PR reduces log messages for spark-sql CLI like spark-shell and pyspark CLI.
### Why are the changes needed?
When we launch spark-sql CLI, too many log messages are shown and it's sometimes difficult to find the result of query.
```
spark-sql> SELECT now();
20/09/02 00:11:45 INFO CodeGenerator: Code generated in 10.121625 ms
20/09/02 00:11:45 INFO SparkContext: Starting job: main at NativeMethodAccessorImpl.java:0
20/09/02 00:11:45 INFO DAGScheduler: Got job 0 (main at NativeMethodAccessorImpl.java:0) with 1 output partitions
20/09/02 00:11:45 INFO DAGScheduler: Final stage: ResultStage 0 (main at NativeMethodAccessorImpl.java:0)
20/09/02 00:11:45 INFO DAGScheduler: Parents of final stage: List()
20/09/02 00:11:45 INFO DAGScheduler: Missing parents: List()
20/09/02 00:11:45 INFO DAGScheduler: Submitting ResultStage 0 (MapPartitionsRDD[2] at main at NativeMethodAccessorImpl.java:0), which has no missing parents
20/09/02 00:11:45 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 6.3 KiB, free 366.3 MiB)
20/09/02 00:11:45 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 3.2 KiB, free 366.3 MiB)
20/09/02 00:11:45 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on 192.168.1.204:42615 (size: 3.2 KiB, free: 366.3 MiB)
20/09/02 00:11:45 INFO SparkContext: Created broadcast 0 from broadcast at DAGScheduler.scala:1348
20/09/02 00:11:45 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 0 (MapPartitionsRDD[2] at main at NativeMethodAccessorImpl.java:0) (first 15 tasks are for partitions Vector(0))
20/09/02 00:11:45 INFO TaskSchedulerImpl: Adding task set 0.0 with 1 tasks resource profile 0
20/09/02 00:11:45 INFO TaskSetManager: Starting task 0.0 in stage 0.0 (TID 0) (192.168.1.204, executor driver, partition 0, PROCESS_LOCAL, 7561 bytes) taskResourceAssignments Map()
20/09/02 00:11:45 INFO Executor: Running task 0.0 in stage 0.0 (TID 0)
20/09/02 00:11:45 INFO Executor: Finished task 0.0 in stage 0.0 (TID 0). 1446 bytes result sent to driver
20/09/02 00:11:45 INFO TaskSetManager: Finished task 0.0 in stage 0.0 (TID 0) in 238 ms on 192.168.1.204 (executor driver) (1/1)
20/09/02 00:11:45 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks have all completed, from pool
20/09/02 00:11:45 INFO DAGScheduler: ResultStage 0 (main at NativeMethodAccessorImpl.java:0) finished in 0.343 s
20/09/02 00:11:45 INFO DAGScheduler: Job 0 is finished. Cancelling potential speculative or zombie tasks for this job
20/09/02 00:11:45 INFO TaskSchedulerImpl: Killing all running tasks in stage 0: Stage finished
20/09/02 00:11:45 INFO DAGScheduler: Job 0 finished: main at NativeMethodAccessorImpl.java:0, took 0.377489 s
2020-09-02 00:11:45.07
Time taken: 0.704 seconds, Fetched 1 row(s)
20/09/02 00:11:45 INFO SparkSQLCLIDriver: Time taken: 0.704 seconds, Fetched 1 row(s)
```
### Does this PR introduce _any_ user-facing change?
Yes. Log messages are reduced for spark-sql CLI like as follows.
```
20/09/02 00:34:51 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
20/09/02 00:34:53 WARN HiveConf: HiveConf of name hive.stats.jdbc.timeout does not exist
20/09/02 00:34:53 WARN HiveConf: HiveConf of name hive.stats.retries.wait does not exist
20/09/02 00:34:55 WARN ObjectStore: Version information not found in metastore. hive.metastore.schema.verification is not enabled so recording the schema version 2.3.0
20/09/02 00:34:55 WARN ObjectStore: setMetaStoreSchemaVersion called but recording version is disabled: version = 2.3.0, comment = Set by MetaStore kou192.168.1.204
Spark master: local[*], Application Id: local-1598974492822
spark-sql> SELECT now();
2020-09-02 00:35:05.258
Time taken: 2.299 seconds, Fetched 1 row(s)
```
### How was this patch tested?
Launched spark-sql CLI and confirmed that log messages are reduced as I paste above.
Closes#29619 from sarutak/suppress-log-for-spark-sql.
Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
ad6b887541