Add --image support to run_remote_tests.

Functionally equivalent to doing a image_to_live with an update_url followed
by a run_remote_tests run.

Allows for easier testing of issues with a given image. As well as
testing of the Autotest update pipeline.

BUG=none
TEST=Ran run_remote_tests.

Change-Id: I7eb7c7eec2ce0d9b155591c6222585a07f5e4868
Reviewed-on: http://gerrit.chromium.org/gerrit/802
Tested-by: Eric Li(李咏竹) <ericli@chromium.org>
Reviewed-by: Eric Li(李咏竹) <ericli@chromium.org>
1 file changed