LoadFirmware() and LoadKernel() handling for test errors

Change-Id: Icecfcab8f5cc30e80da7a2d77a1b1729f5094fee

R=wfrichar@chromium.org
BUG=13107
TEST=make && make runtests

Review URL: http://codereview.chromium.org/6673048
3 files changed