firstboot: start sys-usb

QubesOS/qubes-issues#704

firstboot/modules/qubes_setup.py

@@ -159,6 +159,10 @@ class moduleClass(Module):
             self.configure_default_template()
             self.configure_qubes()
             self.configure_network()
+            if self.choice_usb.get_selected():
+                # Workaround for #1464 (so qvm.start from salt can't be used)
+                self.run_command_in_thread(['systemctl', 'start',
+                                            'qubes-vm@sys-usb.service'])
 
             try:
                 self.configure_default_dvm()