USB image:
- have a stateful partition
- use a read-only system partition
Installer:
- copy read-only system partition from USB to hard drive, skip fsck check
- make stateful partition empty
System:
- Change to tolerate empty stateful partition on bootup
- Don't keep so much of /var on stateful partition (var/lib should be in system
image)
Autoupdate:
- Fix a couple checks to allow partitions 3 and 4 to be system partitions
- Fix a misnomer in mk_memento_images.sh
Review URL: http://chromereview.prom.corp.google.com/1175102
git-svn-id: svn://chrome-svn/chromeos/trunk@87 06c00378-0e64-4dae-be16-12b19f9950a1
