pci_devices: Cope with the changed return value of make_create_command

The make_create_command used to return "devices", but now it returns
"tuple(make_create_devices, spice_options)". Let's allow both by
checking the type.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

qemu/tests/pci_devices.py

@@ -296,6 +296,8 @@ def run(test, params, env):
     env_process.preprocess_vm(test, params, env, params["main_vm"])
     vm = env.get_vm(params["main_vm"])
     qdev = vm.make_create_command()    # parse params into qdev
+    if isinstance(qdev, tuple):
+        qdev = qdev[0]
 
     error.context("Getting main PCI bus info")