noninteractive-tradefed job does not repoted as incomplete when the specified cts or vts url does not exist

[liuyq]

Like the job here:
https://lkft.validation.linaro.org/scheduler/job/2942454#L8881

Resolving testdata.linaro.org (testdata.linaro.org)... 52.215.200.125
Connecting to testdata.linaro.org (testdata.linaro.org)|52.215.200.125|:80... connected.
HTTP request sent, awaiting response...
HTTP/1.1 404 Not Found
Date: Tue, 22 Jun 2021 11:05:32 GMT
Server: gunicorn/19.7.1
Content-Length: 2233
Content-Type: text/html; charset=utf-8
X-Cache: MISS from proxy.lkftlab
X-Cache-Lookup: MISS from proxy.lkftlab:3128
Via: 1.1 proxy.lkftlab (squid/3.5.23)
Connection: keep-alive
2021-06-22 11:05:32 ERROR 404: Not Found.

• true

The download of the cts package failed, but the job was not reported as incomplete.

but this is the failure of the test action, should we mark the job as incomplete?
anyway record the issue here first to see how others think about it.