findmissing: Add timestamp to logging information

A complete robot run now takes more than three hours. Add timestamp
information to logging data to help tracking down the reason.

To fix a new upload error, use "from" keyword when re-raising an
exception.

BUG=None
TEST=Run robot and observe logging data

Change-Id: Idaa34c73ec1d642c0c5943269175ac7ffe80d612
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2618622
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Commit-Queue: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Guenter Roeck <groeck@chromium.org>
Auto-Submit: Guenter Roeck <groeck@chromium.org>
1 file changed