Refactor standalone ACL to only download once
Refactor standalone ACL to only download once

Summary: As above

Reviewed By: spalamarchuk

Differential Revision: D20359292

fbshipit-source-id: 0bc71de6e3252f555d6a90fcfc7eabef89f02b7e

facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter