Replace hard coded timeout values with variables

Currently the timeout values for client/connect/server are hard coded
in templates/haproxy.cfg.j2. In order to give users flexibility to
override these values, for example increase timeout or reduce timeout,
I replaced hard coded timeout values with variables.

The original default values are still kept in defaults/main.yml.

Closes-Bug: #1696703

Change-Id: I72e9691a074df04e9fb7c4ddc0fe610c8d13feff

defaults/main.yml

@@ -75,8 +75,18 @@ haproxy_ssl_bind_options: "no-sslv3"
 
 haproxy_hatop_download_url: "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/hatop/hatop-0.7.7.tar.gz"
 
-## haproxy default timeouts
+## haproxy default
+# Set the number of retries to perform on a server after a connection failure
+haproxy_retries: "3"
+# Set the maximum inactivity time on the client side
+haproxy_client_timeout: "50s"
+# Set the maximum time to wait for a connection attempt to a server to succeed
+haproxy_connect_timeout: "10s"
+# Set the maximum allowed time to wait for a complete HTTP request
 haproxy_http_request_timeout: "5s"
+# Set the maximum inactivity time on the server side
+haproxy_server_timeout: "50s"
+
 
 ## haproxy tuning params
 haproxy_maxconn: 4096

templates/haproxy.cfg.j2

@@ -28,11 +28,11 @@ defaults
         log global
         option dontlognull
         option redispatch
-        retries 3
-        timeout client 50s
-        timeout connect 10s
+        retries {{ haproxy_retries }}
+        timeout client {{ haproxy_client_timeout }}
+        timeout connect {{ haproxy_connect_timeout }}
         timeout http-request {{ haproxy_http_request_timeout }}
-        timeout server 50s
+        timeout server {{ haproxy_server_timeout }}
         maxconn 4096
 
 {% if haproxy_stats_enabled | bool %}