Fixed testsuite name that should be unique

That was missing in
eclipse-jdt#2710

See eclipse-jdt#2536

org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/util/CleanupAfterSuiteTests.java

@@ -25,7 +25,7 @@ public CleanupAfterSuiteTests(String name) {
 	}
 
 	public static Test suite() {
-		TestSuite testSuite = new TestSuite("HouseKeeping_" + count);
+		TestSuite testSuite = new TestSuite("HouseKeeping_" + (count ++));
 		testSuite.addTest(new TestSuite(CleanupAfterSuiteTests.class));
 		return testSuite;
 	}