Updated bootloader configuration phase

The updates determine how to write the grub.conf file as well as kernel
parameters. real_root is defined for build installs and root is used for
nonbuild installs.

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Updated kernel installation phase

wget commands have been removed. The script now assumes kernel configs,
initramfs or tar packages are provided.

If a kernel config is provided, the kernel build will use it. Otherwise, it will
use a default configuration.

An initramfs is now generated if the kernel is being built. That way, the
initramfs corresponds to the kernel version.

Signed-off-by: Byron Sanchez <byron@hackbytes.com>