smbd: Fix raw.batch.exclusive[59]

smbd: Fix raw.batch.exclusive[59]

The level we have to break to depend on the breakers create_disposition:
If we overwrite, we have to break to none.

This patch overloads the "op_type" field in the break message we send
across to the smbd holding the oplock with the oplock level we want to
break to. Because it depends on the create_disposition in the breaking
open, only the breaker can make that decision. We might want to use
a different mechanism for this in the future, but for now using the
op_type field seems acceptable to me.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>