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/virnetserverclienttest.c

@@ -143,7 +143,7 @@ mymain(void)
     int ret = 0;
 
 
-    if (virtTestRun("Identity", 1,
+    if (virtTestRun("Identity",
                     testIdentity, NULL) < 0)
         ret = -1;