Return plain Python dict in GetTestRunStatus RPC.

Goofy RPC caller outside of factory repo cannot unmarshal TestState, so
we need to use primitive Python objects.

BUG=none
TEST=make test
TEST=manually on my DUT

Change-Id: I46e61162e4bb586bfce05e749232c0382e28ca38
Reviewed-on: https://chromium-review.googlesource.com/188476
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
2 files changed