[Piglit] piglit report format

[Sergey Bronnikov]

Hi

I start to use piglit to test video drivers and discover that
piglit supports HTML format only for test results.
But for test results de-facto standart is TAP (see more in
https://en.wikipedia.org/wiki/Test_Anything_Protocol),
not HTML reports. TAP reports will allow to upload results to test
systems like Tapper (tapper-testing.org).
Is it possible to implement TAP support in piglit?"

Sergey B.