Enabling MK_TESTS by default

[Julio Merino]

On Fri, Jun 6, 2014 at 1:21 PM, Craig Rodrigues <rodrigc at freebsd.org> wrote:
> On Wed, Jun 4, 2014 at 2:45 PM, Julio Merino <jmmv at freebsd.org> wrote:
>> Hello all,
>>
>> I think we are ready to enter the new world so I would like to take
>> the final step and make MK_TESTS the default.
>
> Can you explain what is the impact of this?
> What will folks doing "make buildworld", "make buildkernel",
> "make release", "make universe" see after this change?

/usr/tests being populated and atf being installed.

> You'll probably want to send a heads-up e-mail to current@ to let
> folks know it is coming.

That's probably worth it.