After removing mini-omaha related scripts, I think we're close to be ready for making setup/ more simplified.

Currently we have:
 - edit_lsb_factory
 - extract_firmware_updater
 - make_factory_package (for --diskimg and --usbimg)
 - merge_factory_usbimg
 - mount_partition
 - netboot_firmware_settings
 - resize_image_fs

I think we should merge that to a single program like 'cros_sdk', for example "py/tools/imgtool.py" so that:
 imgtool lsb_factory => edit the /etc/lsb_factory file 
 imgtool get_fw_updater => extract_firmware_updater
 imgtool disk => make_factory_package --diskimg
 imgtool usb => make_factory_package --usbimg
 imgtool merge_usb => merge_factory_usbimg
 imgtool mount => mount_partition
 imgtool netboot_firmware => netboot_firmware_settings
 imgtool resize_fs => resize_image_fs

And eventually, Dome may call imgtool to manipulate images, for example creating RMA shim or pre-flash SSD images.