Remove tcp-check connect option for redis on haproxy

tcp-check connect option for redis on haproxy.cfg causes the client
connections in the redis-server to grow continuously and reaches the max
limit resulting in connection failure/response error for requests from
collector and other analytics services to redis.

Change-Id: Id459548fd69b6f87a1514f2bb38a039bbbec256b
Closes-Bug: #1648601

contrail/environment/modules/contrail/templates/generate_haproxy.erb

@@ -87,10 +87,8 @@ frontend  contrail-analytics-api *:8081
 
 backend contrail-analytics-api
     option nolinger
+    timeout server 3m
     balance     roundrobin
-    option tcp-check
-    tcp-check connect port 6379
-    default-server error-limit 1 on-error mark-down
 $__contrail_analytics_api_backend_servers__
 
 #contrail-collector-marker-end