Disabled integtest in core, because there are no *IT tests anymore.

Original commit: elastic/x-pack-elasticsearch@b4343d3ec4

plugin/core/build.gradle

@@ -1,5 +1,3 @@
-import com.carrotsearch.gradle.junit4.RandomizedTestingTask
-import org.elasticsearch.gradle.BuildPlugin
 import org.elasticsearch.gradle.MavenFilteringHack
 
 import java.nio.file.Files
@@ -154,25 +152,5 @@ thirdPartyAudit.excludes = [
 
 // xpack modules are installed in real clusters as the meta plugin, so
 // installing them as individual plugins for integ tests doesn't make sense,
-// so we disable integ tests
+// so we disable integ tests and there are no integ tests in xpack core module
 integTest.enabled = false
-
-// Instead we create a separate task to run the
-// tests based on ESIntegTestCase
-task internalClusterTest(type: RandomizedTestingTask,
-                         group: JavaBasePlugin.VERIFICATION_GROUP,
-                         description: 'Multi-node tests',
-                         dependsOn: test.dependsOn) {
-  configure(BuildPlugin.commonTestConfig(project))
-  classpath = project.test.classpath
-  testClassesDir = project.test.testClassesDir
-  include '**/*IT.class'
-  systemProperty 'es.set.netty.runtime.available.processors', 'false'
-}
-check.dependsOn internalClusterTest 
-internalClusterTest.mustRunAfter test
-
-// also add an "alias" task to make typing on the command line easier
-task icTest {
-  dependsOn internalClusterTest
-}