Set contrail-api workers count to 1 by default

Change-Id: If65b0318ae305dc34c861d828f6e063a639e58ec
Related-PROD: PROD-27001
diff --git a/opencontrail/control/cluster4_0_k8s.yml b/opencontrail/control/cluster4_0_k8s.yml
index cf9a8e7..6e24ac3 100644
--- a/opencontrail/control/cluster4_0_k8s.yml
+++ b/opencontrail/control/cluster4_0_k8s.yml
@@ -21,7 +21,7 @@
     opencontrail_controller_container_name: opencontrail_controller_1
     opencontrail_analytics_container_name: opencontrail_analytics_1
     opencontrail_analyticsdb_container_name: opencontrail_analyticsdb_1
-    opencontrail_api_workers_count: 6
+    opencontrail_api_workers_count: 1
     analytics_vip_address: ${_param:opencontrail_analytics_address}
 # Temprorary fix for MOS9 packages to pin old version of kafka
   linux: