libxl: Makes libxl be able to call Qemu upstream for XenPV guest.

libxl: Makes libxl be able to call Qemu upstream for XenPV guest.

In libxl_build_device_model_args_new:
  - Adds -xen-attach options to the list of arguments to Qemu.
  - Adds -vga xenfb options when vnc and sdl are not set.
  - Remove disk list from the command line for XenPV as they will be
    read from xenstore by Qemu.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
committer: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 tools/libxl/libxl.c |   30 +++++++++++++++++++++---------
 1 files changed, 21 insertions(+), 9 deletions(-)