Pass in the devserver URL and board to gmerge.

For official test images, we don't include the devserver_url
in /etc/lsb-release which I was using when running this test locally.
Set these directly.

BUG=chromium:182314
TEST=Ran it (overrides took effect).

Change-Id: Ie7fafe7d7d4090484ec951258ea14584e8ab43ce
Reviewed-on: https://gerrit.chromium.org/gerrit/45221
Commit-Queue: Chris Sosa <sosa@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
2 files changed