Increase haproxy maximum connections (#36)

Increase the number of concurrent client connections allowed to the
HAProxy pod before connections are put on the Kernel's socket queue.
Internal testing revealed this as a contributing source to latency and
connection timeouts when Redis is under load.

References
----------

-
https://www.haproxy.com/blog/protect-servers-with-haproxy-connection-limits-and-queues

CHANGELOG.md

@@ -11,6 +11,7 @@ Also check this project's [releases](https://github.com/powerhome/redis-operator
 
 ### Fixed
 - [Cleanup Sentinels when bootstrapping and sentinels are not allowed](https://github.com/powerhome/redis-operator/pull/33).
+- [Prevent connection throttling for more than 256 concurrent client connections](https://github.com/powerhome/redis-operator/pull/36)
 
 ### Added
 - [Bootstrap settings - Add an `enabled` parameter to toggle the bootstrap mode on or off for a RedisFailover. (Defaults to `true`)](https://github.com/powerhome/redis-operator/pull/32).

operator/redisfailover/service/generator.go

@@ -143,7 +143,7 @@ func generateHAProxyConfigmap(rf *redisfailoverv1.RedisFailover, labels map[stri
 	port := rf.Spec.Redis.Port
 	haproxyCfg := fmt.Sprintf(`global
 	daemon
-	maxconn 256
+	maxconn 5000
 
 	defaults
 	mode tcp