Decrease max connections to S6010-ON switches by NGS to 1 concurrent

etc/kayobe/inventory/group_vars/dellos9-s6010-on

@@ -92,4 +92,4 @@ kolla_neutron_ml2_generic_switch_extra:
   # aims to provide a trade off between the potential for failures during
   # concurrent configuration and excessive serialisation of operations that
   # already take a long time (~20 seconds per port plug/unplug).
-  ngs_max_connections: 3
+  ngs_max_connections: 1