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Add a detach command to detach without terminating (#21490)

* Add a detach command to detach without terminating (#21376)

* Add a detach command to detach without terminating

Fixes #21154.

* Bump protocol version for app.detach

* Tweak to detach/quit text

* Change logPrefix to named param

* Fix the text that the devicelab attach test looks for
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Danny Tuppeny committed
7fc9165e4ec9fc30144efb9d8fb2809e13ab8d9d
Parent: e55b0f5
Committed by GitHub <noreply@github.com> on 9/6/2018, 2:26:55 PM