Automate manual test compromised stateful partition

The test:
1. Remove files from /mnt/stateful_partion directory.
2. Checks for OOBE screen after rebooting the device with
   corrupted stateful partition.
3. Checks that sign in is possible after OOBE.

BUG=chromium:433076
TEST=Tested locally
DEPLOY=test_importer

Change-Id: I3c526297f5f5669734a10403cb76c989ee54fdb3
Reviewed-on: https://chromium-review.googlesource.com/229657
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>
Commit-Queue: Sridhar Sonti <sontis@chromium.org>
Tested-by: Sridhar Sonti <sontis@chromium.org>
2 files changed