Kola: use file path instead of file descriptor in QEMU command
Kola: use file path instead of file descriptor in QEMU command

   Modified the QEMU command in NewMachine() function to use
   the image file path instead of the file descriptor because
   the file descriptor does not work well with
     qemu-system-aarch64
   Modified setupDisk() function to return the destination
   file path instead of the file descriptor or return error
   message if there is an error

Signed-off-by: lupan2005 <b59ab7d3e845a6c3d0768c2976a0cbc25494522f@gmail.com>

glevand/coreos--mantle,quantum/coreos-mantle,marineam/mantle,dm0-/mantle,dm0-/mantle,quantum/coreos-mantle,marineam/mantle,glevand/coreos--mantle,mjg59/mantle,mjg59/mantle