haproxy httpchk is HTTP only

I remove the “httpchk” options since it cannot be used if mode=tcp.
haproxy will still print a big fat warning saying, mode=tcp with
stats enabled is not possible. But it will starts.

manifests/loadbalancer.pp

@@ -271,7 +271,7 @@ monitor fail if horizon_dead
     options            => {
       'mode'           => 'tcp',
       'balance'        => 'roundrobin',
-      'option'         => ['tcpka', 'tcplog', 'httpchk'], #httpchk mandatory expect 200 on port 9000
+      'option'         => ['tcpka', 'tcplog'],
       'timeout client' => '400s',
       'timeout server' => '400s',
     }