Revision 24695

  * 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.