skip cookies in watchmanctl audit
skip cookies in watchmanctl audit

Summary:
While auditing local working copy changes, I noticed Watchman cookies
would show. These should not be returned from the filesystem walk, as
they're not returned from the query.

Reviewed By: xavierd

Differential Revision: D28816751

fbshipit-source-id: 4bbaf9d72a423b1044c359fea7b310a7f3f8e297

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