[sledge] Add report-summary test make target
[sledge] Add report-summary test make target

Summary: Produce a summary of the test results report.

Reviewed By: ngorogiannis

Differential Revision: D17915840

fbshipit-source-id: 91445cc7b

jvillard/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer