Add missing "header" to PROGRAM OUTPUT section on the template.

Hi Garu,

The template that Common::Client is generating is missing the line
"Output from 'something like make test':"
in the beginning of the PROGRAM OUTPUT.

I think this is necessary in the work of using Common::Client inside CPAN::Reporter, to maintain (at least for now) the same template begin generated and keep the tests from CPAN::Reporter passing :-)

Another way to solve this would be to Common::Client users pass this line concatenated to the test_output parameter, but I'm not sure this is right, basically for 2 reasons:
(1) It's not actually part of the test output.
(2) All other sections have some kind of line/header on beginning hard coded =P

So, if this solution is ok for you, please merge it :-)

PS: And yes, I'm writing all this while I'm almost at your side, lol