[U-Boot] test/py: add timestamps to log

[Tom Rini]

On Fri, Oct 27, 2017 at 11:04:08AM -0600, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> It can be useful to record how long tests take; this can help debug slow
> running test systems or track changes in performance over time. Enhance
> the test system to record timestamps while running test:
> - Whenever a new log file section is started.
> - After U-Boot is started and communication has been established.
> - After each host or U-Boot command is executed.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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