ALLOW_WORLD_READABLE_TMPFILES deprecated

[fvanderbiest]

[DEPRECATION WARNING]: ALLOW_WORLD_READABLE_TMPFILES option, moved to a per
plugin approach that is more flexible, use mostly the same config will work,
but now controlled from the plugin itself and not using the general constant.
instead. This feature will be removed from ansible-base in version 2.14.
Deprecation warnings can be disabled by setting deprecation_warnings=False in
ansible.cfg.