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When data was redacted with context, previously just a unique numeric
identifier was put in place of the data. This wasn't obvious to users of
the logs because sometimes one number was just getting replaced with
another. This is now made clear so that even when we redact with
context, we put a redaction identifier in place of what we removed.

This change also enhances serial number redaction to cover a wider range
of occurrences of serial numbers in logs.

BUG=chromium:940884
TEST=Unit tests pass, manually inspected uploaded feedback report

Change-Id: I57e9a7f612be30eb0823fd0bb9d13ffc16bd3a8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1740132Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: J Kardatzke <jkardatzke@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#685291}