Use builtin autodiscovery of alertmanager

Change-Id: I36bdb3a4e90687d32724e5e248d5862567c36f83
Depends-On: I91e23f17858deb2ef937fcd42948641eb371474b
diff --git a/tests/pillar/server.sls b/tests/pillar/server.sls
index 5f2a2d2..64f31f2 100644
--- a/tests/pillar/server.sls
+++ b/tests/pillar/server.sls
@@ -68,6 +68,14 @@
         evaluation_interval: "1m"
         external_labels:
           region: 'region1'
+      alertmanager:
+        docker_swarm_alertmanager:
+          enabled: true
+          dns_sd_configs:
+            domain:
+              - tasks.monitoring_alertmanager
+            type: A
+            port: 9093
 docker:
   host:
     enabled: true