Description of problem:
I am trying to prepare a kickstart config for a server with serial console. There are several problems:

A. kickstart.cfg generated by the Fedora DVD installation contained the following line:

bootloader [...] --append="rhgb quiet"

I have edited this to read

bootloader [...] --append="console=ttyS0,115200n8"

but the resulting system based on this kickstart.cfg still had "rhgb quiet" in its kernel line in grub.conf (and in addition it had a correct "console" parameter).

B. There should be a better support for configuring/installing servers with
kickstart and serial console: a way how to remove the "splashimage" and "hiddenmenu" from the grub config, and to add something like

serial --unit=0 --speed=115200
terminal --timeout=5 serial console

to grub.conf.

It can be done in the %post-install script. But in my opinion anaconda should take the defaults from the situation during the installation process, so that adding "console=ttyS0,115200" to the command line of the installation DVD kernel should be sufficient for anaconda to add the correct options to grub.conf.

Steps to Reproduce:
1. take an existing kickstart.cfg file
2. edit the --append="rhgb quiet" line to read --append="console=ttyS0,115200n8"
3. install a new system using this kickstart.cfg
  
Actual results:
"rhgb quiet" still present in the kernel command line in the grub.conf of the newly installed system.

Expected results:
Rhgb and quiet boot should not be used over serial console.

Additional info:
Only "A" is a bug, "B" is a request for enhancement.