slapgrid: Fix backward compatibility with SlapObject

slapos/grid/slapgrid.py

@@ -1333,6 +1333,7 @@ stderr_logfile_backups=1
       instance_storage_home=self.instance_storage_home,
       ipv4_global_network=self.ipv4_global_network,
       partition_timeout=self.partition_timeout
+      api_backward_compatibility=self.api_backward_compatibility,
     )
 
     # let managers modify current partition
@@ -2080,6 +2081,7 @@ stderr_logfile_backups=1
             logger=self.logger,
             instance_storage_home=self.instance_storage_home,
             ipv4_global_network=self.ipv4_global_network,
+            api_backward_compatibility=self.api_backward_compatibility,
           )
           local_partition.stop()
           local_partition._updateCertificate()