config_stages_unittest: mark network tests

These two tests access the network (via `gsutil ls`),
so mark them as such.

BUG=None
TEST=tests no longer hang w/out network

Change-Id: I2392589793f6a0c8c23f4f6f6d4a1ed5eec932f0
Reviewed-on: https://chromium-review.googlesource.com/372281
Reviewed-by: Ningning Xia <nxia@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed