Summary:
We've been using "booted" as a shortcut to select a device in `xcrun` but that will only refer to the *first* booted simulator. If you have multiple ones, that causes screenshots, videos and logs to always be pulled from the first.
Of course, this isn't documented anywhere, because Apple, but you can instead of `booted` pass in the "UDID" and refer to a specific device in all cases.
Reviewed By: nikoant
Differential Revision: D24627077
fbshipit-source-id: 2a52a8a17776746af4b3f6ca821dcce37bb0f7c2
9d5ca7de87