[bug#32465] Add iptables service

[Arun Isaac]

Hi,

I generalized this service to work for both iptables and ip6tables. I
added system tests, and made the other corrections that were
suggested. Some questions follow.

- Is the example I added for the iptables.rules sufficient? I couldn't
  find upstream documentation for the iptables.rules format. I suspect
  it doesn't exist. Do you know of any upstream documentation that can
  be referred to here?
- In the attached patch, the fourth test ("inetd echo service is
  accessible after iptables firewall is stopped") doesn't work. In that
  service, I am trying to stop the iptables service, but I'm not able
  to. How do I programmatically stop the iptables service? Is what I
  have done correct?

Any other feedback is also welcome.

Thank you.

0001-gnu-services-Add-iptables-service.patch
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