Augment cleanTest tasks rather than replacing them

Previously I hadn't realized that Gradle's "java" plugin would generate
default "cleanTest" tasks for us.  By defining my own "cleanTest" tasks
we were replacing the generated ones, but what we really wanted to do
was augment them with additional files to delete.

com.ibm.wala.cast.js.rhino.test/build.gradle

@@ -33,9 +33,9 @@ test {
 		exclude '**/FieldBasedJQueryTest.class'
 }
 
-task cleanTest(type: Delete) {
+task cleanTestExtras(type: Delete) {
 	delete 'actual.dump'
 	delete 'expected.dump'
 }
 
-clean.dependsOn cleanTest
+cleanTest.dependsOn cleanTestExtras

com.ibm.wala.core.tests/build.gradle

@@ -45,8 +45,8 @@ test {
 	classpath += files project(':com.ibm.wala.core.testdata').sourceSets.test.java.outputDir
 }
 
-task cleanTest(type: Delete) {
+task cleanTestExtras(type: Delete) {
 	delete 'report'
 }
 
-clean.dependsOn cleanTest
+cleanTest.dependsOn cleanTestExtras

com.ibm.wala.dalvik.test/build.gradle

@@ -150,12 +150,12 @@ test {
 	maxHeapSize = '800M'
 }
 
-task cleanTest(type: Delete) {
+task cleanTestExtras(type: Delete) {
 	delete(
-		'parser.java',
-		'report',
-		'sym.java',
-		)
+			'parser.java',
+			'report',
+			'sym.java',
+	)
 }
 
-clean.dependsOn cleanTest
+cleanTest.dependsOn cleanTestExtras