No install media found when booted from USB

[Moises Henriquez]

When booting a USB stick with a VL ISO written to it (via dd), the installer will crash if no other install source is available.

To repdoduce:

# isohybrid <Name_of_VL_Image.iso>
# dd if=<NAME_OF_ISO.iso> /dev/path_to_usb_stick_device

[Moises Henriquez]

Merged in Uelsk8s/uel-vinstall (pull request #11)

add disk install media detector Fixes #23

→ <<cset 34b2e617a7bf>>