Enable multiworker setup of contrail-api

PROD-18175

Change-Id: I7188b775c004b3354d032de70eccbce11742b6ba
diff --git a/tests/pillar/control3.sls b/tests/pillar/control3.sls
index 2587f2a..7492795 100644
--- a/tests/pillar/control3.sls
+++ b/tests/pillar/control3.sls
@@ -17,6 +17,7 @@
     multi_tenancy: false
     aaa_mode: rbac
     global_read_only_role: demo
+    api_workers: 3
     network:
       engine: neutron
       host: 127.0.0.1