piglit: add a -t/--include-tests option
This implements piglit's -t/--include-tests to allow running only the tests matching the supplied regexp(s).
The 2nd commit prints the number of tests read from the xml profile.
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This implements piglit's -t/--include-tests to allow running only the tests matching the supplied regexp(s).
The 2nd commit prints the number of tests read from the xml profile.