Dongle hangs when launching bootloader from VM

Issue #8 resolved
Marcus Eliasson created an issue

When launching the bootloader from a VM the launch bootloader fails and after that an error is received when trying to send control messages to the dongle (probably hanging).

Host OS Linux (Ubuntu 13.04), VirtualBox 4.3.12, Crazyradio firmware 0.51/0.50, Crazyradio script version c7d74bf, Bitcraze VM 0.2.

When first launched this is seen:

bitcraze@bitcraze-ubuntu:~/projects/crazyradio-firmware$ python usbtools/launchBootloader.py 
Launch bootloader ....
Error!, bootloader not started

After that only the following is seen until the dongle is unplugged:

bitcraze@bitcraze-ubuntu:~/projects/crazyradio-firmware$ python usbtools/launchBootloader.py 
Launch bootloader Traceback (most recent call last):
  File "usbtools/launchBootloader.py", line 94, in <module>
    sys.exit(launchBootloader(True))
  File "usbtools/launchBootloader.py", line 60, in launchBootloader
    handle.controlMsg(0x40, 0xFF, (), value=0, index=0, timeout=100)
usb.USBError: error sending control message: Connection timed out

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