Change-Id: I636f3156e549508230515174edffaff650c9d46e
BUG=chromium-os:6759
TEST=(1)manually built a non-developer recovery image and verified recovery install
completes on an agz device and the device is able to boot from HD upon reboot
(2) repeat for a developer recovery image and verified dev image from dev_payload is installed onto target and the target is able to boot from HD
Review URL: http://codereview.chromium.org/3391018
