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[SPARK-23020][CORE][FOLLOWUP] Fix Java style check issues.

## What changes were proposed in this pull request?

This is a follow-up of #20297 which broke lint-java checks.
This pr fixes the lint-java issues.

```
[ERROR] src/test/java/org/apache/spark/launcher/BaseSuite.java:[21,8] (imports) UnusedImports: Unused import - java.util.concurrent.TimeUnit.
[ERROR] src/test/java/org/apache/spark/launcher/SparkLauncherSuite.java:[27,8] (imports) UnusedImports: Unused import - java.util.concurrent.TimeUnit.
```

## How was this patch tested?

Checked manually in my local environment.

Author: Takuya UESHIN <ueshin@databricks.com>

Closes #20376 from ueshin/issues/SPARK-23020/fup1.

(cherry picked from commit 8c273b4)
Signed-off-by: Marcelo Vanzin <vanzin@cloudera.com>
  • Loading branch information...
ueshin authored and vanzin committed Jan 24, 2018
1 parent 4336e67 commit 2221a30352f1c0f5483c91301f32e66672a43644
@@ -24,7 +24,6 @@
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.TimeUnit;

import org.junit.Test;
import static org.junit.Assert.*;
@@ -18,7 +18,6 @@
package org.apache.spark.launcher;

import java.time.Duration;
import java.util.concurrent.TimeUnit;

import org.junit.After;
import org.slf4j.bridge.SLF4JBridgeHandler;

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