Print out OS name and version in telemetry test.
Print out OS name and version in telemetry test.

Apparently some GPU bots's OS are not what they claim to be.

BUG=
TEST=gpu bots
R=kbr@chromium.org,dtu@chromium.org

Review URL: https://codereview.chromium.org/164413006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@252498 0039d316-1c4b-4281-b951-d872f2087c98

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