Add a trailing slash to file links in the file tab

This avoids a HTTP 301 redirect when trying to open a file from the
file tab which was confusing reverse proxies with SSL termination.

Change-Id: If1cdf11ff6e1e2bae146307a21c1a1aea31c51ed

ara/tests/unit/test_utils.py

@@ -91,7 +91,9 @@ class TestUtils(TestAra):
                 child = child['nodes'][0]
                 self.assertEqual(child['text'], 'main.yml')
                 self.assertEqual(child['dataAttr']['load'],
-                                 ctx['task_file'].id)
+                                 ctx['task_file'].id + '/')
             else:
                 self.assertEqual(f['text'], 'playbook.yml')
-                self.assertEqual(f['dataAttr']['load'], ctx['pb_file'].id)
+                self.assertEqual(
+                    f['dataAttr']['load'], ctx['pb_file'].id + '/'
+                )

ara/utils.py

@@ -136,7 +136,7 @@ def generate_tree(root, paths, mock_os):
             node['dataAttr'] = {
                 'toggle': 'modal',
                 'target': '#file_modal',
-                'load': paths[full_path]
+                'load': paths[full_path] + '/'
             }
         tree.append(node)
     return tree