new delete vm script

scripts/build/deleteallvms.py

@@ -36,9 +36,11 @@ for vm in lines:
 
     proc = subprocess.Popen(['vboxmanage', 'controlvm', vm_id, 'poweroff'], stdout=subprocess.PIPE, shell=True)
     out, err = proc.communicate()
-    print(out)
+    if proc.returncode != 0:
+        print("Error power off VM: {0}, {1}, {2}".format(vm_id, out, err))
     
     proc = subprocess.Popen(['vboxmanage', 'unregistervm', vm_id, '--delete'], stdout=subprocess.PIPE, shell=True)
     out, err = proc.communicate()
-    print(out)
+    if proc.returncode != 0:
+        print("Error unregister VM: {0}, {1}, {2}".format(vm_id, out, err))