[SPARK-26882] Check the Kubernetes integration tests scalatyle

## What changes were proposed in this pull request?

Add the kubernetes integration tests to the scalastyle profiles.

## How was this patch tested?

Run ./dev/scalastyle with a bad change manually

## Follow on work

See SPARK-26898 to add scalastyle for k8s integration to the CI

Closes #23792 from holdenk/SPARK-26882-check-k8s-integration-tests-when-linting.

Authored-by: Holden Karau <holden@pigscanfly.ca>
Signed-off-by: Marcelo Vanzin <vanzin@cloudera.com>

dev/scalastyle

@@ -29,6 +29,7 @@ ERRORS=$(echo -e "q\n" \
         -Phive-thriftserver \
         -Pspark-ganglia-lgpl \
         -Pdocker-integration-tests \
+	-Pkubernetes-integration-tests \
         scalastyle test:scalastyle \
     | awk '{if($1~/error/)print}' \
 )

resource-managers/kubernetes/integration-tests/src/test/scala/org/apache/spark/deploy/k8s/integrationtest/backend/minikube/Minikube.scala

@@ -66,9 +66,12 @@ private[spark] object Minikube extends Logging {
     val kubernetesConf = new ConfigBuilder()
       .withApiVersion("v1")
       .withMasterUrl(kubernetesMaster)
-      .withCaCertFile(Paths.get(userHome, MINIKUBE_PATH, "ca.crt").toFile.getAbsolutePath)
-      .withClientCertFile(Paths.get(userHome, MINIKUBE_PATH, "apiserver.crt").toFile.getAbsolutePath)
-      .withClientKeyFile(Paths.get(userHome, MINIKUBE_PATH, "apiserver.key").toFile.getAbsolutePath)
+      .withCaCertFile(
+        Paths.get(userHome, MINIKUBE_PATH, "ca.crt").toFile.getAbsolutePath)
+      .withClientCertFile(
+        Paths.get(userHome, MINIKUBE_PATH, "apiserver.crt").toFile.getAbsolutePath)
+      .withClientKeyFile(
+        Paths.get(userHome, MINIKUBE_PATH, "apiserver.key").toFile.getAbsolutePath)
       .build()
     new DefaultKubernetesClient(kubernetesConf)
   }