remove nbproc option from haproxy configuration

Since HAProxy 2.5, nbproc option was removed.
As it is set to 1, which is the default value, and that
nbthread option is set, as recommended by haproxy, remove
the option so that it stays compatible for any haproxy version
higher than 2.0.

haproxy/config.go

@@ -19,7 +19,6 @@ var defaultsHAProxyParams = HAProxyParams{
 	Globals: map[string]string{
 		"stats":                     "timeout 2m",
 		"tune.ssl.default-dh-param": "1024",
-		"nbproc":                    "1",
 		"nbthread":                  fmt.Sprint(runtime.GOMAXPROCS(0)),
 		"ulimit-n":                  "65536",
 		"maxconn":                   "32000",