from within the chroot.
It also fixes a number of style issues.
It changes the meaning of cros_workon "list-all" to list all available
packages, and adds "list-live" to list all live packages.
It changes things that load chromeos-common.sh from the installer to
load it from /usr/lib/installer.
BUG=chromium-os:4230
TEST=synced, rebuilt chroot, made packages, made images, built chrome
from source, and wrote an image to a USB stick.
Review URL: http://codereview.chromium.org/6240018
Change-Id: I90c34420af1a64020402bafef8e9e77f56837c02
Add restart_in_chroot_if_needed to common.sh, and modify the build scripts which referred to assert_inside_chroot to use it instead. The effect is that you don't ever have to explicitly enter_chroot.sh to build (still can, it work's fine).
Update mod_image_for_test.sh to use restart_in_chroot_if_needed
Review URL: http://codereview.chromium.org/1736025
