* Check if `enabled_snat` is set in modules arguments (#46754)
If `enabled_snat` is not set at all in module arguments but Neutron
policy sets it by default in Openstack, then `os_router` will attempt to
recreate otherwise perfectly good router.
Follow up for https://github.com/ansible/ansible/issues/44432#issuecomment-428531031
(cherry picked from commit c2b7174d31)
* Add changelog entry
