Keep previous http handler for back-compat

In commit 2eff6ab,
the http handler was renamed to add an "import" in the url, but we need
to keep the previous one for backwards compatability. This is so that
previous versions of sparse_dd in XS 8 can migrate to the latest one.

Signed-off-by: Vincent Liu <[email protected]>

Author: Vincent-lau

ocaml/xapi/xapi_services.ml

@@ -206,6 +206,7 @@ let put_handler (req : Http.Request.t) s _ =
       | [""; services; "SM"; "nbd"; vm; sr; vdi; dp] when services = _services
         ->
           Storage_migrate.nbd_handler req s ~vm sr vdi dp
+      | [""; services; "SM"; "nbdproxy"; vm; sr; vdi; dp]
       | [""; services; "SM"; "nbdproxy"; "import"; vm; sr; vdi; dp]
         when services = _services ->
           Storage_migrate.import_nbd_proxy req s vm sr vdi dp