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This allows the job to use userdata.qcow in the user's /home.

BUG=b:118408409
TEST=sign in, confirm the job is running

Change-Id: I1bcb5ff1cfcae06a7ce404b17ffd2c329419736e
Reviewed-on: https://chromium-review.googlesource.com/c/1367085Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615436}