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: If088ba40e7f0bc420a753ec11bca9dd081ffb160
Partial-Bug: #1648601
(cherry picked from commit 32388a9)

fabfile/templates/collector_haproxy.py

@@ -12,10 +12,8 @@
 
 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