[SPARK-23010][BUILD][FOLLOWUP] Fix java checkstyle failure of kubernetes-integration-tests

## What changes were proposed in this pull request?

Fix java checkstyle failure of kubernetes-integration-tests

## How was this patch tested?

Checked manually on my local environment.

Author: Xingbo Jiang <[email protected]>

Closes apache#21545 from jiangxb1987/k8s-checkstyle.

Author: jiangxb1987

project/SparkBuild.scala

@@ -57,11 +57,11 @@ object BuildCommons {
   val optionallyEnabledProjects@Seq(kubernetes, mesos, yarn,
     streamingFlumeSink, streamingFlume,
     streamingKafka, sparkGangliaLgpl, streamingKinesisAsl,
-    dockerIntegrationTests, hadoopCloud) =
+    dockerIntegrationTests, hadoopCloud, kubernetesIntegrationTests) =
     Seq("kubernetes", "mesos", "yarn",
       "streaming-flume-sink", "streaming-flume",
       "streaming-kafka-0-8", "ganglia-lgpl", "streaming-kinesis-asl",
-      "docker-integration-tests", "hadoop-cloud").map(ProjectRef(buildLocation, _))
+      "docker-integration-tests", "hadoop-cloud", "kubernetes-integration-tests").map(ProjectRef(buildLocation, _))
 
   val assemblyProjects@Seq(networkYarn, streamingFlumeAssembly, streamingKafkaAssembly, streamingKafka010Assembly, streamingKinesisAslAssembly) =
     Seq("network-yarn", "streaming-flume-assembly", "streaming-kafka-0-8-assembly", "streaming-kafka-0-10-assembly", "streaming-kinesis-asl-assembly")