move config file check as part of loading job to do it in multithread fashion...

move config file check as part of loading job to do it in multithread fashion than in a single thread

core/src/main/java/jenkins/model/Jenkins.java

@@ -2602,11 +2602,7 @@ public class Jenkins extends AbstractCIBase implements DirectlyModifiableTopLeve
                 throw new IOException(projectsDir+" is not a directory");
             throw new IOException("Unable to create "+projectsDir+"\nPermission issue? Please create this directory manually.");
         }
-        File[] subdirs = projectsDir.listFiles(new FileFilter() {
-            public boolean accept(File child) {
-                return child.isDirectory() && Items.getConfigFile(child).exists();
-            }
-        });
+        File[] subdirs = projectsDir.listFiles(); 
 
         final Set<String> loadedNames = Collections.synchronizedSet(new HashSet<String>());
 
@@ -2652,6 +2648,10 @@ public class Jenkins extends AbstractCIBase implements DirectlyModifiableTopLeve
         for (final File subdir : subdirs) {
             g.requires(loadHudson).attains(JOB_LOADED).notFatal().add("Loading job "+subdir.getName(),new Executable() {
                 public void run(Reactor session) throws Exception {
+                    if(!Items.getConfigFile(subdir).exists()) {
+                        //Does not have job config file, so it is not a jenkins job hence skip it
+                        return;
+                    }
                     TopLevelItem item = (TopLevelItem) Items.load(Jenkins.this, subdir);
                     items.put(item.getName(), item);
                     loadedNames.add(item.getName());