[Telemetry] Disable telemetry_unittest parallelization on windows
[Telemetry] Disable telemetry_unittest parallelization on windows

I suspect the test was hung due to the lock file implementation creating
a deadlock on windows
(https://code.google.com/p/chromium/codesearch#chromium/src/tools/telemetry/catapult_base/cloud_storage.py&l=202)

BUG=570955

Review URL: https://codereview.chromium.org/1570603005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368339}

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