Clean these files that untracked by git when use jacoco to generate report

• Type: Story
• Status: Open
• Resolution: Unresolved
• Affects Version/s: Master
• Fix Version/s: None
• Component/s: Testing > CI environments
• Labels: None
• Priority Level: Low
• Git Pull Request: https://github.com/dantewang/liferay-portal/pull/667

Jacoco will fail to create report when different class with same name.
The root cause is sometimes the souce code be moved from one directory to another one, when new class file be build during ant all, but the old class files did not be cleaned.

BUILD FAILED
/home/lily/repo/portal-ce/build-common.xml:1974: The following error occurred while executing this line:
/home/lily/repo/portal-ce/build-common.xml:875: Error while creating report
	at org.jacoco.ant.ReportTask.execute(ReportTask.java:501)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:402)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
	at net.sf.antcontrib.logic.IfTask.execute(IfTask.java:217)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:155)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.Target.execute(Target.java:435)
	at org.apache.tools.ant.Target.performTasks(Target.java:456)
	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
	at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
	at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
	at org.apache.tools.ant.Main.runBuild(Main.java:857)
	at org.apache.tools.ant.Main.startAnt(Main.java:236)
	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:287)
	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:113)
Caused by: java.io.IOException: Error while analyzing modules/apps/forms-and-workflow/dynamic-data-mapping/dynamic-data-mapping-form-evaluator/classes/com/liferay/dynamic/data/mapping/form/evaluator/DDMFormEvaluationResult.class.
	at org.jacoco.core.analysis.Analyzer.analyzerError(Analyzer.java:155)
	at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:130)
	at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:147)
	at org.jacoco.core.analysis.Analyzer.analyzeAll(Analyzer.java:185)
	at org.jacoco.ant.ReportTask.createBundle(ReportTask.java:570)
	at org.jacoco.ant.ReportTask.createReport(ReportTask.java:542)
	at org.jacoco.ant.ReportTask.execute(ReportTask.java:495)
	... 44 more
Caused by: java.lang.IllegalStateException: Can't add different class with same name: com/liferay/dynamic/data/mapping/form/evaluator/DDMFormEvaluationResult
	at org.jacoco.core.analysis.CoverageBuilder.visitCoverage(CoverageBuilder.java:107)
	at org.jacoco.core.analysis.Analyzer$1.visitEnd(Analyzer.java:96)
	at org.objectweb.asm.ClassVisitor.visitEnd(ClassVisitor.java:317)
	at org.jacoco.core.internal.flow.ClassProbesAdapter.visitEnd(ClassProbesAdapter.java:98)
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:697)
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:506)
	at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:111)
	at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:127)
	... 49 more