iso_new can create update and win 8 tests.

There are some new variables here:

- OPENQA_HDDPOOL. Defined in openqa.conf.template, used to point
  the directory that contains the hda images

- DUALBOOT. Sent to os-autoinst. Use HDDPATH and HDDVERSION to find
  the proper dual boot scenario (Window 8 only now)

- UPDATE. Use the same variables that DUALBOOT to find the correct
  test scenario: update from openSUSE-12.[123]
I don't like but ... s/UPDATE/UPGRADE/g
Fix HDD image names
Prepare for Windows 8 + UEFI. Set device as ide-hd.