TSAN fix for folly/io/test:shutdown_socket_set_test
TSAN fix for folly/io/test:shutdown_socket_set_test

Summary: TSAN fix for folly/io/test:shutdown_socket_set_test

Differential Revision: D24321155

fbshipit-source-id: 753a808c868da4c608c3ee95d16a3673d6f700b0

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