Summary:
On certain samsung devices, the 'run-as' command, inside adb shell doesn't work.
We don't yet have a workaround for this, otherwise potentially upgrading to android 8.
Distinguish these errors (log them so we'll see how often it happens), and tell the user why it's not working.
Reviewed By: danielbuechele
Differential Revision: D8638728
fbshipit-source-id: f4764120cc27187330a3f236636292a5e63e8ec9