* Joey Hess
- Since lvdisplay may exit 0 even if run with a non-lvm device (such as
/dev/discs/cciss/part0, which it knows isn't a lvm device name and
aborts with an error message, but no failure code), try to make the
isinstallable check for /boot on lvm more robust by grepping the
lvdisplay output for strings that indicate it really found a lvm volume.