detect at runtime whether SKIP should fail
detect at runtime whether SKIP should fail

Summary:
Detect at runtime whether testpilot is the test runner to decide how
to communicate skip status.

Reviewed By: simpkins

Differential Revision: D15073229

fbshipit-source-id: 417a1f4e42d0655e25cc62b0abb016c157d1adea

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly