iotests: Disable data_file where it cannot be used

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20191107163708.833192-22-mreitz@redhat.com
[mreitz: Also disable 273]
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/tests/qemu-iotests/273 b/tests/qemu-iotests/273
index d598c47..00ff79b 100755
--- a/tests/qemu-iotests/273
+++ b/tests/qemu-iotests/273
@@ -37,6 +37,9 @@
 _supported_fmt qcow2
 _supported_proto file
 _supported_os Linux
+# External data files would add nodes to the block graph, so it would
+# not match the reference output
+_unsupported_imgopts data_file
 
 do_run_qemu()
 {