multi-version: do not run new ceph_test_rados against dumpling

Dumpling does not properly order reads (w/ RWORDERED) vs writes.  The code
controlling that was totally rewritten in firefly.  It's not worth backporting.

Signed-off-by: Sage Weil <sage@redhat.com>

suites/multi-version/dumpling-x/basic/2-workload/rados_snap_many_objects.yaml

@@ -1,12 +0,0 @@
-tasks:
-- rados:
-    clients: [client.0]
-    ops: 4000
-    objects: 500
-    op_weights:
-      read: 100
-      write: 100
-      delete: 50
-      snap_create: 50
-      snap_remove: 50
-      rollback: 50