Put the final output of dev_debug_vboot under /var/log/
Put the final output of dev_debug_vboot under /var/log/

Change-Id: I9e7a947541eb6a5b56556038a254ad4017b349b4

R=jimhebert@chromium.org,gauravsh@chromium.org
BUG=chromium-os:8947
TEST=manual

Boot, wait 60 seconds, navigate to chrome://system.
Click the "Expand" button for "verified boot".
You should see useful information.

Review URL: http://codereview.chromium.org/6840005

acorn-marvell/vboot_reference,coreboot/vboot,geekboxzone/mmallow_external_vboot_reference,coreboot/vboot,marineam/seismograph,ionave/seismograph,marineam/seismograph,geekboxzone/mmallow_external_vboot_reference,ccaapton/vboot_reference,marineam/seismograph,geekboxzone/mmallow_external_vboot_reference,ionave/seismograph,geekboxzone/mmallow_external_vboot_reference,coreboot/vboot,coreboot/vboot,ccaapton/vboot_reference,marineam/seismograph,ccaapton/vboot_reference,acorn-marvell/vboot_reference,acorn-marvell/vboot_reference,coreboot/vboot,ionave/seismograph,geekboxzone/mmallow_external_vboot_reference,acorn-marvell/vboot_reference,ccaapton/vboot_reference