tests: Set the QEMU driver as privileged in common code

Most test programs were already doing this, and moving it to
the common code ensures we see consistent behavior across all
QEMU tests.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

tests/qemumemlocktest.c

@@ -51,8 +51,6 @@ mymain(void)
     if (qemuTestDriverInit(&driver) < 0)
         return EXIT_FAILURE;
 
-    driver.privileged = true;
-
 # define DO_TEST(name, memlock) \
     do { \
         static struct testInfo info = { \