MINOR: cleanTest ought to remove output of unitTest task and integrat…

build.gradle

@@ -380,6 +380,15 @@ subprojects {
     }
   }
 
+  cleanTest {
+    subprojects.each {
+      delete "${it.buildDir}/test-results/unitTest"
+      delete "${it.buildDir}/reports/tests/unitTest"
+      delete "${it.buildDir}/test-results/integrationTest"
+      delete "${it.buildDir}/reports/tests/integrationTest"
+    }
+  }
+
   task integrationTest(type: Test, dependsOn: compileJava) {
     maxParallelForks = userMaxForks ?: Runtime.runtime.availableProcessors()
     ignoreFailures = userIgnoreFailures