This adds the boot config files from anaconda to lorax's configdir.
They've been edited to include a '@ROOT@' placeholder, so lorax can put
the proper root=... argument in place, and to use the @VAR@ convention
everywhere (instead of some using @VAR@ and some using %VAR%).
This should probably fix EFI booting, since the EFI BOOT*.conf was
missing its root=... arg.
Also some default settings were changed in syslinux.cfg (so we don't
have to rewrite those two lines every time).
One last change - the '-magic' arg and ppc 'magic' file have been
dropped, because that's kind of silly and unnecessary.
fbd23c4234