If found, sign the packaged firmware autoupdate.
Previously this was hidden behind an environment variable. With this change, the signing script will always try to sign the firmware update if found. If not, it will still perform the remaining steps (rootfs calculation, kernel partition signature etc.).
Also fixed a few minor bugs with the firmware update code.
TEST=created a ToT semi-official build, and ran the signing script on the image. Verified that the firmware got correctly updated (by running chromeos-firmwareupdate on the device). Also tested on images without the packaged firmware update.
Review URL: http://codereview.chromium.org/3292016
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