Merge remote-tracking branch 'mdroth/qga-pull-1-8-2013' into staging

* mdroth/qga-pull-1-8-2013:
  qemu-ga: sample fsfreeze hooks
  qemu-ga: execute hook to quiesce the guest on fsfreeze-freeze/thaw
  qemu-ga: guest_suspend(): improve error reporting
  qemu-ga: bios_supports_mode(): improve error reporting
  qemu-ga: qmp_guest_network_get_interfaces(): get rid of snprintf() + error_set()
  qemu-ga: qmp_guest_fstrim(): get rid of sprintf() + error_set()
  qemu-ga: qmp_guest_fsfreeze_*(): get rid of sprintf() + error_set()
  qemu-ga: build_fs_mount_list(): take an Error argument
  qemu-ga: qmp_guest_shutdown(): improve error reporting
  qemu-ga: qmp_guest_file_*: improve error reporting
  qemu-ga: qmp_guest_file_close(): fix fclose() error check
  qemu-ga: guest_file_handle_find(): take an Error argument

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>