fdc-test: Avoid deprecated 'change' command

Use the preferred blockdev-change-medium command instead.

Also, use of 'device' is deprecated; adding an explicit id on
the command line lets us use 'id' for both blockdev-change-medium
and eject.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20170427215821.19397-10-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

tests/fdc-test.c

@@ -298,8 +298,8 @@ static void test_media_insert(void)
 
     /* Insert media in drive. DSKCHK should not be reset until a step pulse
      * is sent. */
-    qmp_discard_response("{'execute':'change', 'arguments':{"
-                         " 'device':'floppy0', 'target': %s, 'arg': 'raw' }}",
+    qmp_discard_response("{'execute':'blockdev-change-medium', 'arguments':{"
+                         " 'id':'floppy0', 'filename': %s, 'format': 'raw' }}",
                          test_image);
 
     dir = inb(FLOPPY_BASE + reg_dir);
@@ -330,7 +330,7 @@ static void test_media_change(void)
     /* Eject the floppy and check that DSKCHG is set. Reading it out doesn't
      * reset the bit. */
     qmp_discard_response("{'execute':'eject', 'arguments':{"
-                         " 'device':'floppy0' }}");
+                         " 'id':'floppy0' }}");
 
     dir = inb(FLOPPY_BASE + reg_dir);
     assert_bit_set(dir, DSKCHG);
@@ -564,7 +564,7 @@ int main(int argc, char **argv)
     /* Run the tests */
     g_test_init(&argc, &argv, NULL);
 
-    qtest_start(NULL);
+    qtest_start("-device floppy,id=floppy0");
     qtest_irq_intercept_in(global_qtest, "ioapic");
     qtest_add_func("/fdc/cmos", test_cmos);
     qtest_add_func("/fdc/no_media_on_start", test_no_media_on_start);