autotest: Start peerd for tests via upstart

This lets us take advantage and test more of the actual environment
peerd runs in reality.  In this case, it means we'll start to run
peerd as the peerd user rather than root.

BUG=chromium:402672
TEST=peerd_* tests continue to pass after this change.

Change-Id: I97f523468aecbd2561d34c8643704a0fd8e37dc6
Reviewed-on: https://chromium-review.googlesource.com/225469
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
Tested-by: Christopher Wiley <wiley@chromium.org>
4 files changed