webui: need to set a mimetype for subunit stream file

[Evan]

Clicking on test_runner.python-scipy-subunit-stream for a ticket triggers a download. However, all the other files are displayed in the browser as text and the subunit stream should be no different.

[Vincent Ladeuil (vila)]

The test runner doesn't specify the mime type for the stream, feel free to bounce that bug to me if that's the root cause.

Note that, in the long run, we'll use the subunit v2 format which is binary though.

[Chris Johnston (cjohnston)]

Based on the comment from vila on bug #1290401 and the discussions we had
yesterday, I would think we would want these files to be downloaded so that
the user can run subunit-1to2 ~/Downloads/autopkgtest-subunit-stream |
subunit2junitxml
on it

[Andy Doan (doanac)]

Even though we want them to download, since its plain text its really easy to make this viewable in the browser:

http://bazaar.launchpad.net/~canonical-ci-engineering/ubuntu-ci-services-itself/trunk/view/head:/test_runner/tstrun/run_worker.py#L68

            subunit_url = store.put_file(artifact_name,
                                         subunit_stream)

Just add 'text/plain' as the last parameter, ie:

            subunit_url = store.put_file(artifact_name,
                                         subunit_stream, 'text/plain')