Make running tests in contrib build optional for audio/logitechmediaserver

[mat]

We try to not have negative options, it would be better to have a "TEST" one and reverse the logic.

[mark_tranquillussoftware.co.uk]

Change to positive option as per comments

[woodsb02]

Hi Mark,
Can you please explain why you would want to skip the tests for the Perl modules that were build by the vendor instructions/source? Surely these tests are intended to confirm the Perl modules function correctly?
Thanks,
Ben

[mark_tranquillussoftware.co.uk]

In D8872#193773, @woodsb02 wrote:

Hi Mark,
Can you please explain why you would want to skip the tests for the Perl modules that were build by the vendor instructions/source? Surely these tests are intended to confirm the Perl modules function correctly?

I've had multiple reports that the loopback tests are failing when folks are building inside a jail as they're not getting the address they expect. This avoids that problem.

[woodsb02]

Looks ok to me