Expose text report for unit test code coverage
Expose text report for unit test code coverage

Summary: At the request of msys

Reviewed By: lblasa

Differential Revision: D38740940

fbshipit-source-id: 25722144037ce404ef7572e9553037e7344c6955

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper