update to latest test infrastructure

releng.wtpbuilder/distribution/incubator.tests/testScripts/test.xml

@@ -6,6 +6,12 @@
     <echo
         level="info"
         message="starting Automated Eclipse Testing" />
+	
+	
+	<!-- doesn't seem we had to do this before, in other test.xml's, so, 
+	not sure that's changed, but doing now to make sure all is installed -->
+	<property name="clean" value="yes" />
+	
     <echo
         level="debug"
         message="basedir: ${basedir}" />