brillo_test_launcher: Enable passing arguments to tests.

This allows setting arguments to a scheduled test.  Effectively, this
converts a list of 'NAME=VAL' strings into corresponding argument
assignments and prepends them to the test control file.

BUG=b:24774860
TEST=Arguments passed to autoupdate_EndToEnd, test runs successfully.

Change-Id: Iba7caa63065bfd296774a6863d8e87126c10ab30
Reviewed-on: https://chromium-review.googlesource.com/307030
Commit-Ready: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
1 file changed