when executeRequest accepts a wildcard metadata, fall back to old logic
when executeRequest accepts a wildcard metadata, fall back to old logic

Reviewed By: praihan

Differential Revision: D38102594

fbshipit-source-id: a9b91fad13daa12827a26f5b2ad493efddcf8cb5

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift