* Do not join flag parameters
This put a comma between every character of the tcp flag parameters, resulting in a bad iptables command.
Fixes#36490
* Use suboptions to ensure tcp_flags options are lists
* Add unit tests for tcp_flags
* Add example of how to use tcp_flags
(cherry picked from commit c9d3bb59a4)
* 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
