Description of problem:
using --append in a kickstart file will remove console=ttyS0,115200

Version-Release number of selected component (if applicable):
anaconda 12.15 (the one we have in F12 Alpha)

How reproducible:
always

Steps to Reproduce:
1. install 2 machines as follows
   machine A:
     + boot into kickstart with console=ttyS0,115200
     + use a kickstart file containing:
       bootloader --location=mbr
   machine B:
     + boot into kickstart with console=ttyS0,115200
     + use a kickstart file containing:
       bootloader --location=mbr --append="banana"
2. note, both kickstarts have a one liner in %post that erases 'rhgb quiet' from grub.conf as I need to be able to see what the machines do at boot.
  perl -p -i -e 's/ rhgb quiet//g' /boot/grub/grub.conf
3. let kickstart install finish
4. boot the machines into the freshly installed OS
  
Actual results:
bootloader --location=mbr
ends up being:
Kernel command line: ro root=/dev/mapper/vg_oma01-lv_root
console=ttyS0,115200 LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16
KEYTABLE=us

bootloader --location=mbr --append="banana"
ends up being:
Kernel command line: ro root=/dev/mapper/vg_oma03-lv_root banana
LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us 

Expected results:
if with --append we keep LANG, SYSFONT and KEYTABLE, I would expect it to also keep my console=
This is especially annoying on machines that have only serial output

Additional info:
rawhide today has anaconda 12.25 but that is not installable for me, AttributeError: 'module' object has no attribute 'F12_AutoPart', do tell if you want this tested against a later anaconda or if you need me to write a new rawhide ks file just for this test (seems the autopart is not being digested, so worst case I manually craft partition info for the test)