Anaconda/Features/Plymouthize

Installer images should use plymouth for boot progress. Everyone loves bootsplash, right?

Stuff that needs doin'

• Fix up this feature page
• lorax: put plymouth in the initramfs
• anaconda: customize boot splash to show progress for long-running items
  • fetching/mounting root/repo
  • fetching kickstart
  • etc.
• anaconda: properly shut down plymouth for a smooth transition
  • see this gdm patch