s3:locking: prepare the data model for leases_db to cope with dynamic path renames.

s3:locking: prepare the data model for leases_db to cope with dynamic path renames.

interface leases_db
{
        typedef [public] struct {
                GUID client_guid;
                smb2_lease_key lease_key;
        } leases_db_key;

        typedef [public] struct {
                file_id id;
                [string,charset(UTF8)] char *servicepath;
                [string,charset(UTF8)] char *base_name;
                [string,charset(UTF8)] char *stream_name;
        } leases_db_file;

        typedef [public] struct {
                uint32 num_files;
                [size_is(num_files)] leases_db_file files[];
        } leases_db_value;
}

As designed by metze.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>