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Update devicelab test with new message prefix (#19560)

While working on attach, I changed the message output while waiting for an app to connect but didn't catch this.
D
Danny Tuppeny committed
6016882a56dd9f8a3cfe806041cb159f8ac3fed9
Parent: ed9afbb
Committed by GitHub <noreply@github.com> on 7/19/2018, 1:59:20 PM