Recursive listing of the images directory & fixes bug when uploading no files.

gns3server/templates/upload.html

@@ -10,7 +10,7 @@
     {%if files%}
         <h2>Files on {{gns3_host}}</h2>
         {%for file in files%}
-            <p>{{image_path}}/{{file}}</a></p>
+            <p>{{file}}</a></p>
         {%endfor%}
     {%endif%}
 {% endblock %}