Be able to use http-reuse to make connections pooling with backends (introduced with hap 1.6)

Author: djnos

lib/synapse/haproxy.rb

@@ -37,6 +37,7 @@ class Haproxy
         "http-check send-state",
         "http-request",
         "http-response",
+        "http-reuse",
         "id",
         "ignore-persist",
         "log",
@@ -166,6 +167,7 @@ class Haproxy
         "hash-type",
         "http-check disable-on-404",
         "http-check send-state",
+        "http-reuse",
         "log",
         "maxconn",
         "mode",
@@ -377,6 +379,7 @@ class Haproxy
         "http-check send-state",
         "http-request",
         "http-response",
+        "http-reuse",
         "id",
         "ignore-persist",
         "log",