[Telemetry] Reraising exception properly to avoid swallowing original stack trace
[Telemetry] Reraising exception properly to avoid swallowing original stack trace

Use sys.exc_info() to capture original exception stack:

See http://pastebin.com/WCV3ctYq

Review URL: https://codereview.chromium.org/1408143007

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#358877}

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