chaos_analyzer: Fix the key messages packet matching.

1. Changes to correctly detect the key message 1-4 packets in case the key
descriptor version is different.
2. Couple of output string formatting changes.

BUG=chrome-os-partner:40900
TEST=Manually ran the script.

Change-Id: Id1ae157213380b7465e3e6c74f2baa08c496aff3
Reviewed-on: https://chromium-review.googlesource.com/275013
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Roshan Pius <rpius@chromium.org>
Tested-by: Roshan Pius <rpius@chromium.org>
1 file changed