Committing one ipfw(8) userland patch

[Neel Chauhan]

Thank you all for your feedback.

Using the same Phabricator revision here: 
https://reviews.freebsd.org/D24234

I have added the src-ip4/dst-ip4 and src-ipv4/dst-ipv4 specifiers and 
made src-ip/dst-ip dual-stack, to be consistent with me/me4/me6 
described in this thread.

Could you all please give your opinions on it?

-Neel

On 2020-04-10 04:10, Lev Serebryakov wrote:
> On 10.04.2020 13:46, Andrey V. Elsukov wrote:
> 
>> On 07.04.2020 20:35, Rodney W. Grimes wrote:
>>> But that is not what this review does.  I would be in support of
>>> changing the "official" names to src-ip4/dst-ip4/src-ip6/dst-ip6
>>> and making src-ip/dst-ip a backwards compatible alias.
>> 
>> I also think this idea sounds better.
> 
> +1