Minor update for USB test cases

This pullreq has some minor fix and updates for USB related test script.

Qingtang Zhou (4):
  virttest.boot: Move USB related code out of boot.py
  Qemu Test: Create a separated script for usb device
  virttest.usb_boot: make this case run on windows guest
  Qemu Test: Move usb.py to usb_storage.py

 qemu/tests/cfg/usb.cfg        |  24 +++-
 qemu/tests/usb.py             | 291 ------------------------------------------
 qemu/tests/usb_basic_check.py |  90 +++++++++++++
 qemu/tests/usb_storage.py     | 291 ++++++++++++++++++++++++++++++++++++++++++
 tests/boot.py                 |  68 +---------
 5 files changed, 400 insertions(+), 364 deletions(-)
 delete mode 100644 qemu/tests/usb.py
 create mode 100644 qemu/tests/usb_basic_check.py
 create mode 100644 qemu/tests/usb_storage.py