Change extensions list type

This patch changes type of extensions pillar to dictionary

Change-Id: Ia8b155766daa111973e90bd59aacaec6a3778506
Related-PROD: PROD-14689
diff --git a/tests/pillar/gateway_qos.sls b/tests/pillar/gateway_qos.sls
index fea882e..f816c94 100644
--- a/tests/pillar/gateway_qos.sls
+++ b/tests/pillar/gateway_qos.sls
@@ -7,9 +7,11 @@
       mechanism:
         ovs:
           driver: openvswitch
+      extension:
+        qos:
+          enabled: true
     dvr: false
     enabled: true
-    qos: true
     external_access: True
     local_ip: 10.1.0.110
     message_queue: