Dispatcher not reading boot_cmds from image

[Tyler Baker]

The dispatcher is not reading boot_cmds from the image.

From master.py _boot_linaro_image:
        boot_cmds = self.deployment_data['boot_cmds']
        options = boot_options.as_dict(self, defaults={'boot_cmds': boot_cmds})
        if 'boot_cmds' in options:
            boot_cmds_override = True
            boot_cmds = options['boot_cmds'].value

'boot_cmds' will always be in options, since we are passing in a default value/and or boot_option has a default value defined in the device configuration. Essentially, this _ALWAYS_ overrides the boot_cmds from the image, and is _NOT_ expected to function in this manner.