initramfs-live-boot: make it more generic and easy to use
The script was making some assumptions that enforced many requirement
in the machine kernel configuration and usage, besides it were too
while booting.
Changes included:
* fix indentation;
* rdepends on udev;
* allow use of isofs as module;
* remove rootdelay param parsing as it was unused;
* don't verbosely kill udevd and mknod;
* mount devtmpfs into rootfs, if available, before swithing root;
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
