RFE: Support kickstart files in rescue mode

[Alexander Todorov <atodorov redhat com>]

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Good morning folks,
the requested feature will be useful for automation. I'm targeting rescue mode
test automation but it can be used for automating common tasks in rescue mode if
one is administering pool of machines. The minimal ks.cfg file is:
- ---
lang en_US
keyboard us
network --device eth0 --bootproto dhcp --onboot yes
cdrom
#url --url http://path/to/stage2.img

%post --nochroot
mkdir -p /mnt/sysimage
mount -t ext3 /dev/sda1 /mnt/sysimage
echo "system is mounted" >> /mnt/sysimage/root/rescue.log
%end

%post
cat /etc/fedora-release >> /root/rescue.log
uname -a >> /root/rescue.log
%end

%post --nochroot
echo "system will be unmounted" >> /mnt/sysimage/root/rescue.log
umount /mnt/sysimage
%end


Everything before %post is currently parsed and understood by the loader.
Currently kickstart is supported only when booting in rescue mode with the
"nomount" option because the changes are smaller and easier to review. Patches
are coming shortly. Please review them.

Thanks,
Alexander.
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