eden: remove an old bug workaround when servicing globs
eden: remove an old bug workaround when servicing globs

Summary:
This TODO dates from 2 years ago now, and EdenFS has been updated to the latest
version by now, thus this bug is gone. We should remove the workaround and benefit
from probably faster glob queries. For now just add a config that allows us to trigger the fixed code path, this config will be removed after being rolled out everywhere.

Reviewed By: kmancini

Differential Revision: D27129978

fbshipit-source-id: 46f3c575a7c3ee5f8a670af7145df831b47729f7

facebook/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman