Remove test case average timing

The test case average timing code has not been used by any test
case ever. Delete it to remove complexity.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

tests/nodedevxml2xmltest.c

@@ -69,9 +69,9 @@ mymain(void)
 {
     int ret = 0;
 
-#define DO_TEST(name) \
-    if (virtTestRun("Node device XML-2-XML " name, \
-                    1, testCompareXMLToXMLHelper, (name)) < 0) \
+#define DO_TEST(name)                                           \
+    if (virtTestRun("Node device XML-2-XML " name,              \
+                    testCompareXMLToXMLHelper, (name)) < 0)     \
         ret = -1
 
     DO_TEST("computer");