Update the edxapp cloudformation template.

  - Add SSL forwarding to the Loadbalancer.
  - Perform the health check against the server's heartbeat page.

cloudformation_templates/edx-reference-architecture.json

@@ -1786,10 +1786,17 @@
               "Ref":"WebServerPort"
             },
             "Protocol":"HTTP"
+          },
+          {
+            "LoadBalancerPort":"443",
+            "InstancePort":{
+              "Ref":"WebServerPort"
+            },
+            "Protocol":"HTTP"
           }
         ],
         "HealthCheck":{
-          "Target":"TCP:22",
+          "Target":"HTTP:80;/heartbeat",
           "HealthyThreshold":"3",
           "UnhealthyThreshold":"5",
           "Interval":"30",