Add haproxy to list of applications

PROD-31587

Change-Id: Ie4e3f765b63fbea428526f7612ac3ffbe17251d9
(cherry picked from commit 0780fef8bdee01033c1f7baceacf3c82c30bfc7d)
diff --git a/haproxy/proxy/single.yml b/haproxy/proxy/single.yml
index dc9c668..b470247 100644
--- a/haproxy/proxy/single.yml
+++ b/haproxy/proxy/single.yml
@@ -1,4 +1,2 @@
-parameters:
-  haproxy:
-    proxy:
-      enabled: true
+classes:
+- service.haproxy.proxy.single