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The Python logger module will record the timing information for
messages, which will be useful to track how long notarization takes.

This also links the stdout and stderr streams, so that any output does
not get improperly interleaved due to buffering or issues with the log
collector.

Change-Id: I7c52f20e2dc439c13c1b13a15f8912a56e180e97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900210Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712998}