getdeps: ask testpilot to re-run failed tests up to 3 times

Summary: This helps to squash out some flakiness

Reviewed By: pkaush

Differential Revision: D17804696

fbshipit-source-id: decd8e5dd37d802c62cae1168c4f4d72c0fc5c83

Author: wez

build/fbcode_builder/getdeps/builder.py

@@ -504,6 +504,7 @@ def list_tests():
                 self.build_opts.fbsource_dir,
                 "--buck-test-info",
                 buck_test_info_name,
+                "--retry=3",
                 "--test-config",
                 "platform=%s" % machine_suffix,
                 "buildsystem=getdeps",