container: Pass --nvram option to virsh undefine

- Similar to the way we did in another place. Otherwise, the command won't work
on UEFI based VMs.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>

container

@@ -1416,7 +1416,7 @@ class VM(Machine):
 
         logger.info('Running `virsh destroy %s`', self.machine_name)
         try:
-            self._virsh(['undefine', self.machine_name],
+            self._virsh(['undefine', '--nvram', self.machine_name],
                         stdout=subprocess.DEVNULL)
         except subprocess.CalledProcessError:
             pass