Use mode tcp for glance-registry balancing

The glance-registry service is returning 401 to httpchk, which
makes haproxy think it is down. This change switches the check
mode to tcp.

Closes-Bug: 1468566
Closes-Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1234637

Change-Id: Icdd80aa9cd56e5afd3707eb7fa38aaedb8535af6

manifests/loadbalancer.pp

@@ -684,8 +684,8 @@ class tripleo::loadbalancer (
       ipaddress        => hiera('glance_registry_vip', $controller_virtual_ip),
       ports            => 9191,
       options          => {
-        'option' => [ 'httpchk GET /' ],
-      },
+        'mode' => 'tcp',
+      }
       collect_exported => false,
     }
     haproxy::balancermember { 'glance_registry':