tests: Remove unneeded "-vnc none" option

Some tests use the "-vnc none" option without any clear reason,
making those tests break when --disable-vnc is specified on
./configure.  Remove the unnecessary option.

Reviewed-by: John Snow <jsnow@redhat.com>
Tested-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

tests/ide-test.c

@@ -620,7 +620,6 @@ static void test_retry_flush(const char *machine)
     prepare_blkdebug_script(debug_path, "flush_to_disk");
 
     ide_test_start(
-        "-vnc none "
         "-drive file=blkdebug:%s:%s,if=ide,cache=writeback,format=raw,"
         "rerror=stop,werror=stop",
         debug_path, tmp_path);

tests/ipmi-bt-test.c

@@ -415,7 +415,7 @@ int main(int argc, char **argv)
     /* Run the tests */
     g_test_init(&argc, &argv, NULL);
 
-    cmdline = g_strdup_printf("-vnc none"
+    cmdline = g_strdup_printf(
           " -chardev socket,id=ipmi0,host=localhost,port=%d,reconnect=10"
           " -device ipmi-bmc-extern,chardev=ipmi0,id=bmc0"
           " -device isa-ipmi-bt,bmc=bmc0", emu_port);

tests/ipmi-kcs-test.c

@@ -276,7 +276,7 @@ int main(int argc, char **argv)
     /* Run the tests */
     g_test_init(&argc, &argv, NULL);
 
-    cmdline = g_strdup_printf("-vnc none -device ipmi-bmc-sim,id=bmc0"
+    cmdline = g_strdup_printf("-device ipmi-bmc-sim,id=bmc0"
                               " -device isa-ipmi-kcs,bmc=bmc0");
     qtest_start(cmdline);
     qtest_irq_intercept_in(global_qtest, "ioapic");