Make SHA benchmark output follow convention.
Make SHA benchmark output follow convention.

Review URL: http://codereview.chromium.org/660317

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