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The catapult CL [1] will introduce a change where running adb commands
may now raise device_errors.DeviceUnreachableError if the device is
no longer found.

This change adjusts clients that were hoping to catch this kind of
error as a device_errors.[Adb]CommandFailedError.

[1]: https://codereview.chromium.org/2808763004/

BUG=https://github.com/catapult-project/catapult/issues/3476

Review-Url: https://codereview.chromium.org/2811993002
Cr-Commit-Position: refs/heads/master@{#464383}