sanitycheck: add --log-file to log everything to a file too
sanitycheck: add --log-file to log everything to a file too

Currently CI plays tricks with `tee` to capture the output and post
process it. This makes it more complex to handle and easier for it to
fail in ways it should not.

So add a simple log capture option sanity check that mirrors the
stdout output, removing color encoding for errors.

Change-Id: I6de0b6cfe4da9c289f537979545dddbcd49cf834
Signed-off-by: Inaky Perez-Gonzalez <96af2f95d738a33e3cb28686ea74cc090643af9b@intel.com>

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