Normally, images are signed for USB boot and the HD boot patch is in
the stateful partition. Official image are resigned, and the kernel
partition needs no patch for HD boot. Since folks generating updates
generally don't need to patch, this CL turns off patching by default.
BUG=5975
TEST=Generated update payload
Review URL: http://codereview.chromium.org/3167035
Also, enforce use of cros_generate_update_payload to generate images.
BUG=5771
TEST=Ran ./cros_generate_update_payload to make full update
Review URL: http://codereview.chromium.org/3135024
This script wraps the old memento udpate generator and the new delta
updater. It will also generate new-style full updates soon, which are
full updates that use the delta-update format, when that code is ready.
BUG=5248
TEST=ran local script to do full/delta update
Review URL: http://codereview.chromium.org/2873082