Ref: configuration class shouldn't create and handle directory, DirectoryManager should do it

src/main/java/com/sheepit/client/Server.java

@@ -95,6 +95,7 @@ public class Server extends Thread {
 	private Configuration user_config;
 	private Client client;
 	private Log log;
+	private DirectoryManager directoryManager;
 	private long lastRequestTime;
 	private int keepmealive_duration; // time in ms
 	
@@ -107,6 +108,7 @@ public class Server extends Thread {
 		this.user_config = user_config_;
 		this.client = client_;
 		this.log = Log.getInstance(this.user_config);
+		this.directoryManager = new DirectoryManager(this.user_config);
 		this.lastRequestTime = 0;
 		this.keepmealive_duration = 15 * 60 * 1000; // default 15min
 		
@@ -690,7 +692,7 @@ public class Server extends Thread {
 	
 	private String generateXMLForMD5cache() {
 		List<FileMD5> md5s = new ArrayList<>();
-		for (File local_file : this.user_config.getLocalCacheFiles()) {
+		for (File local_file : this.directoryManager.getLocalCacheFiles()) {
 			try {
 				String extension = local_file.getName().substring(local_file.getName().lastIndexOf('.')).toLowerCase();
 				String name = local_file.getName().substring(0, local_file.getName().length() - 1 * extension.length());