Move setting for world-readable-tempfiles back to global config.

The code that depends on this is all in the action plugins so we should
leave it there until we either move that action plugin code over
(fixup_perms2) or we give action plugins the ability to register new
config.

lib/ansible/utils/module_docs_fragments/shell_common.py

@@ -78,15 +78,4 @@ options:
         key: admin_users
     vars:
       - name: ansible_admin_users
-  allow_world_readable_temp:
-    type: boolean
-    description:
-        - This makes the temporary files created on the machine to be world readable and will issue a warning instead of failing the task.
-        - It is useful when becoming an unprivileged user.
-    ini:
-      - section: defaults
-        key: allow_world_readable_tmpfiles
-    vars:
-      - name: ansible_world_readable_tmpfiles
-    version_added: "2.1"
 """