Revert "[Autotest] Copy only new data in /var/log folder after each test."

A number of issues have come up regarding this change:

https://code.google.com/p/chromium/issues/detail?id=223086
https://code.google.com/p/chromium/issues/detail?id=222793


This reverts commit 4c90cb9b25954953dbe409f292b031b54eaad17a

Change-Id: Ia9dd6059209959ba2d3ebd5cc5915b2a1fa02a6a
Reviewed-on: https://gerrit.chromium.org/gerrit/46266
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: Scott Zawalski <scottz@chromium.org>
4 files changed