[moblab] Change the user of the moblab_id file to be moblab.

The utility is run as the root user from upstart, so the file
is created as owner root, change the owner to be moblab.

This is causing some security tests to fail.

BUG=None
TEST=local moblab

Change-Id: I2206adcc5350503a45d59821fad38e2e7052b2ec
Reviewed-on: https://chromium-review.googlesource.com/1636682
Commit-Ready: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
1 file changed