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The usage string wasn't appending a newline to the end which caused weird output when shown. Add a proper usage() helper and extend the output a bit to be more human friendly. BUG=chromium:660209 TEST=`pad_digest_utility` is nice BRANCH=None Change-Id: I01c3c5372a4202bc6f5a9b2c5fe0e2a59c3ca5cf Reviewed-on: https://chromium-review.googlesource.com/404768 Commit-Ready: Mike Frysinger <vapier@chromium.org> Tested-by: Mike Frysinger <vapier@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>