It is old and not used anymore

mdadm 3.1.1 switched to use metadata 1.1 by default. This does not work
with extlinux so we set metadata to old default manually for /boot.

also, fix issue when /var/lib/apk/installed is included

this works around an issue when lbu wrongly assumes /media/usb is
mounted when /media/usbdisk is.

ref #91

scripts in /etc/lbu/pre-package.d/ will be executed prior creating the
tar ball and scripts in /etc/lbu/post-package.d/ will be executed after.

if pre-scripts fails, then will package not be created.

ref #220

see #179

This fixes #177, the issues with "No operating system found" on boot

This should fix detecting /dev/cciss/c0d0 from /dev/cciss/c0d0p1

this will filter out loop0 device

try avoid ending up with a lbu media without any apkovl.

The old way did not detect ida/c0d0. The new should detect it.
We also filter out md devices.

mkinitfs is supposed to create the links to current kernel

This helps us avoid the issues when disk changes from sda to hda

it gives error messages in case syslinux.cfg is not there.