livecd.py: Import utilities

Forgot to import utilities.
livecd.py: Copy more syslinux menu files
livecd.py: Let kernel package create initramfs

Don't explicitely create it, let kernel package postinstall handle
this. We can drive the process with our configuration file.
livecd.py: Don't need to explicitely include ext3
livecd.py: Rewrite EFI configuration to support UEFI Secure Boot

Copy the code from Fedora livecd. However this code uses grub2
which we don't actually have packaged so we leave it disabled.
livecd.py: Fix splash image copy
livecd.py: Fix syslinux configuration

We don't have distroname anymore, use title.
livecd.py: Fix _has_checkisomd5()
raw.py: Don't need to explicitely include ext3
livecd.py: Fix error logging when initramfs copying is failed

Replace a leftover from Fedora's code.
raw.py: Cleanup and fix initramfs configuration