* move set_module_args to units.modules.utils
* unit tests: reuse set_module_args
* unit tests: mock exit/fail_json in module.utils.ModuleTestCase
* unit tests: use module.utils.ModuleTestCase
* unit tests: fix 'import shadowed by loop variable'
* Add some tests for iptables
* Fix remove bug (calls 2 times check to remove a chain)
* Add me as maintainer
* Fix PEP8
* Doc: Give more information on issue #18988
* Fix#18988 and test it
* Fix doc (thanks Pillou)
* enable PEP8 check for iptables