Make sure to clean up temp-dirs in 'weaver' module

Maven Clean now deletes '' directories if it finds any. Furthermore,
AsynchronousFileCacheBackingTestSupport now not just deletes directory
contents but also removes the empty corresponding directories
afterwards.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

pom.xml

@@ -222,7 +222,10 @@
 						<fileset>
 							<directory>.</directory>
 							<includes>
+								<!-- AspectJ core dumps -->
 								<include>**/ajcore.*.txt</include>
+								<!-- Test temp-dirs in 'weaver' module, see AsynchronousFileCacheBackingTestSupport.getCacheDir -->
+								<include>**/dir-0.*/**</include>
 							</includes>
 							<followSymlinks>false</followSymlinks>
 						</fileset>

weaver/src/test/java/org/aspectj/weaver/tools/cache/AsynchronousFileCacheBackingTestSupport.java

@@ -59,14 +59,17 @@ public abstract class AsynchronousFileCacheBackingTestSupport
     protected void cleanupCache() {
     	if (indexFile != null) {
     		if (FileUtil.deleteContents(indexFile) > 0) {
-    			System.out.println("Deleted " + indexFile);
+    			System.out.println("Deleted index file: " + indexFile);
     		}
     		indexFile = null;
     	}
 
     	if (cacheDir != null) {
     		if (FileUtil.deleteContents(cacheDir) > 0) {
-    			System.out.println("Deleted " + cacheDir);
+    			System.out.println("Deleted cache directory content: " + cacheDir);
+    		}
+        if (cacheDir.delete()) {
+    			System.out.println("Deleted cache directory: " + cacheDir);
     		}
     		cacheDir = null;
     	}