Fix file and copy modules on py3 and enable tests. (#17239)

- Fix octal formatting of file mode in module response on py3.
- Convert file path to unicode in copy action.
- Enable file and copy module tests for py3 now that they pass.

lib/ansible/plugins/action/copy.py

@@ -113,7 +113,7 @@ class ActionModule(ActionBase):
             # Walk the directory and append the file tuples to source_files.
             for base_path, sub_folders, files in os.walk(to_bytes(source)):
                 for file in files:
-                    full_path = os.path.join(base_path, file)
+                    full_path = to_unicode(os.path.join(base_path, file), errors='strict')
                     rel_path = full_path[sz:]
                     if rel_path.startswith('/'):
                         rel_path = rel_path[1:]