add transparent vault use to other plugins (#16957)

assemble, script and unarchive (copy already had it).

lib/ansible/plugins/action/assemble.py

@@ -48,7 +48,8 @@ class ActionModule(ActionBase):
             fragment = "%s/%s" % (src_path, f)
             if not os.path.isfile(fragment) or (ignore_hidden and os.path.basename(fragment).startswith('.')):
                 continue
-            fragment_content = file(fragment).read()
+
+            fragment_content = file(self._loader.get_real_file(fragment)).read()
 
             # always put a newline between fragments if the previous fragment didn't end with a newline.
             if add_newline: