qemuxml2xmltest: set driver as privileged

Some validation check might reject unprivileged drivers in the future.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NPeter Krempa <pkrempa@redhat.com>
Tested-by: NAndrea Bolognani <abologna@redhat.com>

tests/qemuxml2xmltest.c

@@ -162,6 +162,7 @@ mymain(void)
         return EXIT_FAILURE;
 
     cfg = virQEMUDriverGetConfig(&driver);
+    driver.privileged = true;
 
 # define DO_TEST_INTERNAL(_name, suffix, when, ...) \
     do { \